Video Link

This tool is used for truing the values for your Muzzle Velocity or Ballistic coefficient. The process for truing both of these is similar and both will be covered here.

Should I true the Muzzle Velocity or Ballistic Coefficient? Our recommendation depends on whether you have an accurate Chronograph available. If you do not have a Chronograph, we recommend truing the Muzzle Velocity. If you do have a Chronograph, we recommend first measuring the Muzzle Velocity using the Chronograph and then truing the Ballistic Coefficient using this tool.

Be sure to true scope correction before truing muzzle velocity or ballistic coefficient.

• Enter all parameters for your firearm and confirm your normal zero
• Select a Range based on this tool's recommendation. The recommended range is around 15% before the range at which the bullet is 1.2 times the speed of sound.
• Fire on target and adjust turret until on target.
• Enter turret value into Required Dial Up field.
• Choose to true either Muzzle Velocity or Ballistic Coefficient.
• Review calculated trued value.
  • If Error is shown, then the difference required to true the firearm was too large. You may have entered an incorrect value or need to start with more accurate values first.
  • If Unchanged is shown, then the firearm is already trued. Nothing further needs to be done.
  • If a value is shown, this is the value calculated for the Ballistic Coefficient or Muzzle Velocity which would result in impact at the given range. If trued value is acceptable, press Set to switch to that value.

 Video Link

This shows an analysis of how sensitive point of impact is to parameters. The purpose is to provide a sense of the relative importance of different parameters.

These analyses are calculated by solving for the amount of change required in one parameter to cause impact to change by a given amount. In the analysis, all other parameters are left unchanged. The distance solved for in the analysis is 1in for Imperial and 2.5cm for metric).

It is important to understand that sensitivity may be dependent on the other parameters. For instance, different parameters have different importance at different ranges. Latitude affects the significance of Azimuth and its impact on earth-based effects.

The same analysis is made for both positive and negative variation; sometimes these can differ substantially.

In some cases, a variable may not have any (or only a very small) effect on the point of impact. These may be reported as NA in the table.

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This tab is used to generate range cards and other data based on your configuration.

For any of the cards, you may choose to email or print the card using the buttons in the toolbar.

This card shows standard ballistic data for varying ranges.

• Range: distance corresponding to this row of the card
• Path: how are the bullet is below the scope reticle at this range. This distance is given both in a linear distance (inch/cm) and scope angle (MOA/mil).
• Drift: how are the bullet has drifted left or right. This is given in both linear distance (inch/cm) and scope angle (MOA/mil).
• Velocity: projectile velocity at this range.
• Energy: energy of the projectile at this range.
• TOF (Time-of-Flight): time since bullet has left muzzle.

This card shows ballistic data for varying winds. This card can be useful to quickly make wind holds based on changes in wind speed and direction.

• Wind Speed: wind speed in MPH or km/h.
• Elevation: Scope setting for this wind. This may have small changes with wind caused by Aerodynamic Jump.
• Wind Hold: The hold required for this wind.

This card provides details about current firing configuration.

Create a small table of dial up and wind holds. This is intended to be printed and taped to your rifle stock as a quick reference to be used at shorter ranges if a more complete solution is not available. Ranges are only included out to 500yd (500m and wind speeds up to 5 MPH (metric: 10 km/h). The ballistic solutions are calculated for zero inclination, no earth effects (Coriolis or Eötvös), and no target movement.

 Video

These settings control operation of the Heads Up Display (HUD). They are available in the Settings, but are provided here for quick access.

• Using Tripod: When enabled, this indicates you are shooting from a tripod. Use of a tripod can allow a certain amount of barrel rise, requiring an adjustment in order to impact target. When enabled, a warning is shown in the HUD so you remember to turn it off.
• Target Mode: This allows selecting between Single and Multi. Single Target Mode is used for individual targets. Multi-Target Mode allows organizing sets of targets which will be shot in groups. When Multi-Target Mode is selected, (1) the HUD no longer shows information about impact and instead shows listings for up to 5 targets in the current group, (2) the current selected target and those after it are shown if they are in the same group, (3) Rain and Mirage selectors are shown in smaller form.
• Max Ordinate Units: By default, Max Ordinate is expressed as a scope angle (MOA or mil). This allows the shooter/spotter to know the approximate location in the scope. When this is enabled, the Max Ordinate is shown in distance (feet or meters).
• Hold for Aerodynamic Jump (Single): When enabled, vertical holds are split into two components: the portions not affected by wind and the portion that is. The first is summed and rounded to your scope turret units to be dialed in. The second is a vertical hold you can make based on changes in the wind. The purpose of this is to make it easier to hold for Aerodynamic Jump. When making these calculations, the full accuracy is retained when determining the hold so that any fraction not used in the turret adjustment is included in the vertical hold. Because of this, there may be a non-zero vertical hold even when no wind is present. Note that this affects both the HUD and the Wind Card on the Range Card.
• Relative Wind (Multi): When enabled, the Wind Direction for targets is adjusted according to the relative Azimuth compared to the selected target (which has a highlighted border). This allows the wind direction to be set once for the selected target and have it automatically adjusted for the other targets. This also causes the adjusted relative wind to be shown for each target in the HUD table.
• Moving Targets: When enabled, moving targets are supported. This causes the Mover Speed setting within Target section to be shown and additional Mover Speed and Mover Hold fields to be shown in the HUD. Holds for moving targets are not incorporated into the holds; only an incremental hold is shown, which must be added/subtracted to the wind hold according to direction of movement. If not in use, you may wish to turn this off to reduce clutter on the HUD.
• Show Temperature & Pressure: When enabled, Temperature and Pressure are shown in the HUD. You may wish to disable this to reduce clutter.
• Prefer MOA Fractions: When enabled, fractions (e.g., ¼) will used in the HUD in place of decimal values. This may be helpful in making turret adjustments. This setting only affects MOA-based turrets (not mil). Fractions will also be used in other situations, when appropriate.
• Inclination & Azimuth Tool: When enabled, the internal accelerometer sensor in your device will be used in the Inclination & Azimuth Tool to determine your angle of inclination.

This tool estimates the speed of a moving target using range, your scope reticle, and a timer.

Use of this tool requires a rifle or spotting scope with an appropriate reticle. The reticle must have measurements. Please be sure to refer to your rifle scope manual to ensure you know how to correctly read measurements with your reticle. See Rifle Scope section below for more information.

This assumes you know the Range to the target. If you do not know the range, you can use the Ranging Tool to estimate this.

After the range has been determined, there are two methods to using this tool: Known Distance Method and Known Time Method. In each method, you will first set the Movement Distance or Movement Time and the use your scope reticle and a Timer or Stop Watch to determine the other parameter. The steps for each method are provided below.

These are the settings and controls used to operate the tool.

• Range: The range to the target. This is used with the Reticle value to determine the distance the target moves. Changing this value affects other parts of this app.
• Reticle: The observed angle measured by your scope reticle for the amount of distance the target moves. Changing this value causes the Movement Distance to be updated.
• Movement Distance: The observed amount of motion of the target. Normally, the Reticle is used and this value is only read for confirmation. However, in some cases it may be easier to estimate distance of movement, such as if there are large objects in the field of view of know size. Changing this value causes the Reticle measurement to be updated.
• Time: Amount of time the target moved across the given distance. You can enter a value here or use the Stop Watch to measure a time.
• Mover Speed: This is the calculated speed of the target.
• Set Mover Speed: Press Set to change the mover speed to the calculated speed and close this tool.
• Timer / Stop Watch Selection: This selects the mode of the time button either as a Stop Watch or Timer.
• Timer Button: This button operates a Timer or Stop Watch depending on the mode selected. The button is intended to be operated while looking in your rifle scope so it is very large and vibrates. For improved accuracy, the button is triggered when you touch it (most IOS buttons are triggered when you lift up).

In Timer mode, the button is pressed once to start a timer based on the current Time value. The timer counts down the time and it alerts when expired. It vibrates once when started. It vibrates twice and flashes the screen when it expires. This mode is used with the Known Time Method.

In Stop Watch mode, the button is pressed twice: once to start a stop watch and a second time to stop the watch and store the elapsed time in the Time field (and update the estimated Mover Speed). It vibrates once when started and twice when stopping. This mode is used with the Known Movement Distance Method.

With this method, the Range and Time are determined in advance and the Reticle is measured while using the Timer.

1. Set mode to Timer.
2. Ensure Range is correct.
3. Enter desired time in Time.
4. Observe target in scope.
5. Press Start button.
6. When timer expires, enter reticle distance the target has moved in Reticle.
7. Confirm Movement Distance and Speed values.
8. Press the Set button.

With this method, the Range and Reticle are determined and the Time is measured with the Stop Watch.

1. Set mode to Stop Watch.
2. Ensure Range is correct.
3. Enter desired distance in Reticle.
4. Observe target in scope.
5. Press Start button.
6. Press Stop button when target has moved the expected distance.
7. Confirm Time and Speed values.
8. Press the Set button.

It is important to know what focal plane your scope uses. You can determine this by changing the magnification level. If the reticle size changes with magnification level, then the scope uses first focal plane. If the reticle size remains the same, then the scope uses second focal plane.

• First Focal Plane: This is the preferred type of scope. First focal plane reticles change size as you adjust your scope magnification. A first focal plane scope reticle can be used at any magnification level.
• Second Focal Plane: Care must be used when measuring angles with this type of scope. The reticle stays the same size regardless of magnification. Reticle measurements are only valid at a specific magnification level.This is commonly the highest magnification; sometimes it is a magnification level marked on the numbering with a tick. We recommend using this tool only when a second-focal plane scope is at this magnification level.
  For other magnification levels, any reticle measurements must be adjusted appropriately. For instance, if you use 1/2 the magnification level, then the reticle measurements will be double (2x).

 Video

This tool is used for ranging and sizing targets with the reticle on your rifle scope.

Use of this tool requires a rifle scope with an appropriate reticle. The reticle must have measurements. Please be sure to refer to your rifle scope manual to ensure you know how to correctly read measurements with your reticle.

It is important to know what focal plane your scope uses. You can determine this by changing the magnification level. If the reticle size changes with magnification level, then the scope uses first focal plane. If the reticle size remains the same, then the scope uses second focal plane.

• First Focal Plane: This is the preferred type of scope. First focal plane reticles change size as you adjust your scope magnification. A first focal plane scope reticle can be used at any magnification level.
• Second Focal Plane: Care must be used when measuring angles with this type of scope. The reticle stays the same size regardless of magnification. Reticle measurements are only valid at a specific magnification level. This is commonly the highest magnification; sometimes it is a magnification level marked on the numbering with a tick. We recommend using this tool only when a second-focal plane scope is at this magnification level.
  For other magnification levels, any reticle measurements must be adjusted appropriately. For instance, if you use 1/2 the magnification level, then the reticle measurements will be double (2x).

This tool calculates the size of objects using known range to the object and your scope reticle.

• Range: The range to the target. Changing this value will affect other parts of this app.
• Reticle: The observed angle measured by your scope reticle.
• Object Size: The calculated size of the object.

This tool calculates range to a target using known size of the object and your scope reticle.

• Object Size: The size of the object.
• Reticle: The observed angle measured by your scope reticle.
• Range: The calculated range to the target.
• Set Range: Pressing this button sets the calculated range to be the new target range.

This section lists various common hunting animals and their typical size, measured as the distance from back to brisket. Pressing the button next to the animal will set the Object Size to this size. You can use these buttons to quickly set the object size.

The Scope Correction Factor is used to account for error in vertical holds with your rifle scope. The default correction factor is 1.00000, which indicates no correction is required for your scope.

Determining your Scope Correction Factor should only be necessary once for the scope, since the correction factor normally remains the same for the life of the scope.

This process is often called the Tall Target Test as it involves firing at a tall target at short ranges.

The instructions below describe firing on the tall target. An alternative method is to secure your scope in a fixed jig which ensures the scope has no movement. This alternative does not require firing on the target and may be somewhat more accurate.

• Select a short range of around 50-100 yd. A short range is used so that there are almost no ballistic effects on the bullet.
• Select a tall target to use. The target should be tall enough that the bullet will still impact when you dial the turret. You can use this tool to calculate the required size of the target.
• Place a target at range of around 50-100 yd. A short enough range should be used that there are almost no ballistic effects on the bullet. The target should be placed vertically (as measured with a level or plumb) and have a vertical line its entire length (again, measured with a level or plumb).
• Carefully measure the range and enter in Range field.
• Set rifle scope turret to zero.
• Shoot near the bottom of target.
• Dial turret to a large value. We recommend at least 30 MOA.
• Enter this in the Dial Up field.
• Shoot at target again.
• Carefully measure distance between groups and enter this as Actual Impact.
• Review the calculated correction factor and press Set Scope Correction Factor. Going forward correction factor will be multiplied by any vertical holds.

This tool is used to understand how inaccuracy in the parameters you have entered for your rifle, scope, bullet, or target affect the point of impact.

One of the important analysis is the Circular Error Probable (CEP). This determine the minimum size circle of error which contains a certain fraction of impacts. This tool provides an inner CEP of 50% and an outer circle of 95%. The circles correspond to the area that will be impacted with 50% and 95% of the time, respectively.

The CEP values selected by this tool do not match those used in the CEP link. While CEP can be associated with normal distributions and standard deviations, the CEP displayed by this tool are calculated by sorting the results of the Monte Carlo simulation, not by multiplying the standard deviation.

The results of the simulation can be shown either in Graphical or Table display.

In Graphical display, the simulated points of impact are shown on a target display. Each simulated shot is shown as a small red circle. The target is automatically scaled according to how much dispersion the bullets have. The center of the target (marked by black cross hairs) shows desired point of impact.

A grid is with 1 MOA or 0.1 mrad spacing is shown.

Green shaded rings are shown for 50% and 95% CEP. A final circle is shown for the maximum error distance. When using a Normal Distribution this final ring can be fairly large due to a high-error shot with low probability.

An option circular or square plate may be shown, if the option is enabled.

A small secondary green cross-hair is shown for the average impact point which is normally near the target center, but may vary depending on the type of error introduced.

The Table display shows a numerical analysis of the dispersion. An Average and Maximum Error is shown. For each axis, the Minimum, Maximum, Average, and Standard Deviation are shown.

Values are shown both in absolute distance as well as MOA or mrad units.

Circular Error Probable values are shown for the 50% and 95% of samples.

If enabled, hit probability for a circular or square plate is shown.

The Monte Carlo method is used for the analysis. This simply means that a simulation is repeatedly run. For each simulation, the tool selects random error based on selections you make and then simulates the shot based on the randomly chosen amount of error. After simulating a given number of times, the results are analyzed and displayed to show the pattern of impact that could occur.

The number of samples used for the Monte Carlo simulation. More samples can improve accuracy of the results but requires more time. This defaults to 1000. The minimum value is 1 and maximum value is 10,000.

There are two types of error distributions used by this tool: Linear Distribution and Normal Distribution. A background in statistics may be helpful to fully understand this setting.

With a Linear Distribution, the error values will fall in the range of +/- error for each selected error value. Each possible value has the same probability as any other. The error values will all fall into the range and will never exceed the give error value.

Important: The error values will extend over a range that is 2x the error value you enter. For instance, if you enter a Zero Offset error of 1in, then the error at the given 100yd range will be over 2 x 1in = 2in, which roughly corresponds to a 2 MOA range. For 1 MOA, you would use a value of 0.5 in.

With a Normal Distribution, the error value you enter is the the standard deviation of the error. As such, 68% of error values will be within the given range of error, +/-. If a muzzle velocity error of 10fps is set, then 68% of error will be in the range -10fps to +10fps (a total range of 20fps) of the muzzle velocity set for the bullet. This means some errors (approximately 32%) will fall outside this range.

The Recalculate button causes the simulation to be re-run. There is normally not a need to use this since new simulations are run whenever a value is changed.

An optional plate may be specified using the following settings. When enabled, the simulation tracks the probability of hitting the plate.

The point of aim for the simulation is the center of the plate. Note that in some situations the type of error may move the average point of impact from the center and the shooter may benefit from not using the center of the target as the point of aim. This effect is not accounted for in this analysis since the center of the target is used as the point of aim.

The plate will be shown in graphical display as a gray circle/square. In the table display, the hit/miss analysis and percentage are shown.

• Enable: Enables/disables use of the plate.
• Shape: Allows selection of circular or square plate.
• Size: Specifies the size of the plate. This is the diameter of the circle or the length of the sides of the square.

For each of the parameters, you can choose whether or not to introduce error for that parameter and (if so) how much error. By default, no error is introduced and all shots impact the center of the target.

When a parameter is changed, a new simulation is automatically started and the results are shown as soon as completed. There may be a small delay running the simulation.

The parameters may be individually enabled/disabled and the size of distribution adjusted. If error for a parameter is enabled but the amount of error is left at 0, this is the same as disabling that error.

You can enable as many or as few parameters as you choose. If no parameters are enabled, then the simulation will show no error. If a single parameter is selected, then only a single source of error is shown. As parameters are added, these are incorporated into the simulation. If all parameters are enabled, then all will be varied in the simulations.

Error parameters are shared among all rifles and are not saved with them. If you change rifles, the error parameters will be unchanged.

Zero Inclination Lock is ignored for the purposes of the simulation. It is treated as though it were turned off.

 Video

This tab is used for configuring parameters for your firearm. Changes made to the parameters listed here are immediately applied to your setup and reflected in the HUD and range cards.

These are the parameters of your rifle and scope that affect the bullet and its trajectory.

• Name: Name to label rifle. The name has no effect on the rifle performance.
• Rifle Twist: This is the twist rate of your rifle, measured in length (in/cm) per complete revolution. The twist rate should have been provided by your firearm manufacturer. If unsure, you can insert a cleaning rod and carefully measure the distance the rod must be inserted to make a full 360° rotation.
• Scope Turret: The units for your scope turrets (and reticle). This is normally either MOA (minutes of angle) or mrad (milliradians, mil). You can normally find the units by looking at the current adjustment, possibly after removing the turret cap. MOA is typically given in quarter units (0.25 MOA). mrad is are typically adjusted in tenths (.1 mrad).
• Scope Height: This is the height of the scope above your barrel. You can use the provided Scope Height Tool. Use calipers to measure the distance from the center of your barrel to the center of your rifle scope. This will normally be 1-3in.
• Scope Correction: This is a correction factor to adjust for any error in the vertical movement of your scope. This can be an important factor when shooting at long-range with correspondingly large turret adjustment. You can use the provided provided Scope Correction Tool for this.

These are the parameters of your bullet that affect its flight.

You can enter them manually as described below. Alternatively, you may wish to use parameters from the catalog included with this program. Press the catalog button next to Bullet, select a Caliber, Brand, and Model. Press Ok to accept the values from the catalog. The catalog will provide all parameters except Lot and Muzzle Velocity (muzzle velocity will be specific to your rifle and bullet combination).

• Name: Name to label rifle. The name has no effect on the rifle performance.
• Caliber: The diameter of your projectile. This can be found from your bullet manufacturer and is typically listed on the package.
• Length: The length of your bullet. This can be found from your bullet manufacturer and is typically listed on the package. This value is important for the gyroscopic stability of your bullet.
• Mass: The mass of your bullet. This is typically measured in grains. This can be found from your bullet manufacturer is typically listed on the package.
• Lot: The lot of your bullet as listed on your ammunition package. This is useful for record keeping purposes. When changing ammunition lot, you may wish to check your zero.
• Ballistic Coefficient: The ballistic efficiency of the bullet as it moves through air. A value is typically provided by your bullet manufacturer and is listed on the package. This program only uses the G7 ballistic coefficient. Be sure not to use other coefficients, such as the older G1.If you have a chronometer, you should measure the muzzle velocity for your actual firearm and then use our Ballistic Coefficient Truing Tool to determine the actual value of the Ballistic Coefficient. If you do not have a chronometer, you should use the approximate value from your manufacturer.
• Muzzle Velocity: The speed of the bullet as it exits the muzzle. An approximate value is typically provided by your bullet manufacturer and is listed on the package and this may be a good starting point. The actual muzzle velocity will be determined by your rifle and bullet combination and will normally not match the generic value provided by the manufacturer. If you have a chronometer, you should measure the muzzle velocity for your actual rifle. If you do not have a chronometer, you can use our Muzzle Velocity Truing Tool to determine the actual value.
• Spin Rate: The rate at which the bullet is spinning when it leaves the muzzle. This value is calculated and is direct function of Rifle Twist and Muzzle Velocity. It is recommended to have a spin below 300,000 RPM since too high of a spin can cause bullet to malfunction. If spin rate is too high, this is highlighted in yellow. This can be corrected by using bullets with lower muzzle velocity or switching to a rifle with a longer Rifle Twist. See also documentation on Gyroscopic Stability.
• Gyroscopic Stability: The stability of the bullet from the spin imparted by rifling. This is calculated as a complex function of rifle twist, bullet caliber, length, ballistic coefficient, and muzzle velocity. Higher numbers are more stable. A gyroscopic stability of at least 1.6 is recommended. If the calculated gyroscopic stability is below this value, this will be highlighted in yellow. This can be corrected by using heavier/longer/higher-velocity bullets or a rifle with shorter rifle twist. See also documentation on Spin Rate.

The zero section contains information about how the rifle was zeroed. These are the parameters of how you set your zero.

• Range: The distance at which you zeroed your rifle. This is typically 100yd or small multiples of that. It is important that your Zero Range be accurate. An inaccurate range will result in inaccuracies when calculating solutions for longer ranges.
• Height: The height above (for negative: below) the zero for the point of impact. If your zero was the same as the point of impact, this can be left as 0.
• Offset: The distance to right (for negative: to left) of the zero for the point of impact. If your zero was the same as the point of impact, this can be left as 0.
• Scope Angle: This shows the calculated angle between rifle and scope. This is an important component of any firing solution. The default is for this to be calculated prior to any solution. In most cases it is recommended to lock this value immediately after zeroing. This will retain accuracy if you later use the rifle under different conditions. For example, consider if a rifle is zeroed and then taken into high mountains. By locking the angle, the conditions under which the rifle was zeroed are effectively stored in the angle value. This allows accurate solutions to be calculated for the new conditions without re-zeroing the rifle.
  Important: If you re-zero your rifle it is necessary to unlock and re-lock this setting so the new angle can be calculated.

These are the environmental factors that that affect your bullet's flight.

• Pressure: The air pressure. This is measured with barometric sensor. If you turn on Use Pressure from Device, the internal sensor in your phone will be used.
• Temperature: The ambient air temperature. If your range finder provides this data, you can use it. Otherwise, you can enter manually.
• Humidity: The humidity of the air. If your range finder provides this data, you can use it. Otherwise, you can enter manually.
• Density: The density of the air around you. This is calculated based on Pressure, Temperature, and Humidity

Wind is a crucial factor for accurate shooting at longer ranges. Normally, wind is entered in the HUD or by the Mirage or Rain tool in the HUD.

• Speed: The speed of the wind.
• Direction (Relative): The direction of the wind, relative to the direction to the target. This is expressed in clock values. Note that wind direction is given as the direction the wind is coming from, not its direction of motion. A 3 O'Clock wind is moving from left to right.

The following parameters are related to an individual target.

• Folder: (Only present when in Multi-Target Mode.) A folder button can be pressed to see the table of current targets.
• Name: (Only present when in Multi-Target Mode.) This is used to name the current target.
• Range: The range to the target. If you have a range finder, this will be provided automatically. Otherwise, you will enter it manually. You can also use the provided Ranging Tool to estimate the range.
• Inclination: The angle you are shooting up or down, measured in degrees. If you are shooting flat, this is 0°. If you are using a range finder with appropriate sensor, this will be entered automatically. You can use the provided Inclination and Azimuth Tool which calculates inclination using the device's internal accelerometer.
• Angle Modified Range: The horizontal range to your target. This is calculated using Range and Inclination values and gives indication of horizontal distance to your target. The calculation is range x cos(inclination)
• Latitude: Your current position on Earth. This is measured in degrees and is needed to determine Coriolis-based effects. You can enable Use Device Latitude to automatically fill this using your devices internal GPS sensor.
• Azimuth: The direction to your target, measured in degrees from True North. This is used to determine Coriolis based effects. Inclination and Azimuth Tool which uses your device's internal compass.
• Using Tripod: When enabled, this indicates you are shooting from a tripod. Use of a tripod can allow a certain amount of barrel rise, requiring an adjustment in order to impact target. Important: This option is not associated with specific target and must be turned on/off as needed.
• Speed: (Only if Moving Targets is enabled in the options below.) The lateral (left/right) speed of a moving target. No direction is indicated. You can use the provided Mover Speed Tool to estimate the mover speed using range, your scope reticle, and a timer.

The following values are calculated for the bullet impact on target.

• Time of Flight: The time from your bullet leaving muzzle to impacting the target. This is calculated using the other values you have entered.
• Retained Velocity: The velocity of your bullet at the point of impact. This is calculated using other values you have provided. For hunting, it is recommended that velocity be at least 1600fps for lead core bullets or 2000fps for copper core bullets so that the bullet can function correctly. This value is highlighted in red or yellow if the calculated velocity is below these values.
• Retained Energy: The energy of your bullet at the point of impact. This is calculated using the other values you have provided.
• Impact Angle: The angle of motion at impact for your projectile. This is relative to your line-of-sight (scope angle). This is shown both in angle and in incline (in/yard or cm/meter). This may be helpful to estimate the effect incorrect range will have on your bullet's point of impact.

The following values are calculated and provide information about your firearms operation under the current conditions.

• Speed of Sound: The speed of sound in current conditions
• Transonic Range: The range beyond which your projectile will no longer be supersonic.
• Max Hunting Range (Copper): The range beyond which your projectile will no longer be at least 2000 ft/s. 2000 ft/s is recommended as the minimum velocity for copper core bullets to function properly. This is calculated for 0° inclination (the entered Inclination is not used).
• Max Hunting Range (Lead): The range beyond which your projectile will no longer be at least 1600 ft/s. 1600 ft/s is recommended as the minimum velocity for lead core bullets to function properly. This is calculated for 0° inclination (the entered Inclination is not used).
• Accuracy Analysis: Press this button to see an simulation analysis of impact patterns based on error data you enter. See the Help there for more information.
• Sensitivity: Press this button to present an analysis of how sensitive point of impact is for each parameter. The purpose is to provide a sense of the relative importance of different parameters. See the Help there for more information.

These settings are control operation of the Heads Up Display (HUD).

• Target Mode: This allows selecting between Single and Multi. Single Target Mode is used for individual targets. Multi-Target Mode allows organizing sets of targets which will be shot in groups. When Multi-Target Mode is selected, (1) the HUD no longer shows information about impact and instead shows listings for up to 5 targets in the current group, (2) the current selected target and those after it are shown if they are in the same group, (3) Rain and Mirage selectors are shown in smaller form.
• Max Ordinate Units: By default, Max Ordinate is expressed as a scope angle (MOA or mil). This allows the shooter/spotter to know the approximate location in the scope. When this is enabled, the Max Ordinate is shown in distance (feet or meters).
• Hold for Aerodynamic Jump (Hunting): When enabled, vertical holds are split into two components: the portions not affected by wind and the portion that is. The first is summed and rounded to your scope turret units to be dialed in. The second is a vertical hold you can make based on changes in the wind. The purpose of this is to make it easier to hold for Aerodynamic Jump. When making these calculations, the full accuracy is retained when determining the hold so that any fraction not used in the turret adjustment is included in the vertical hold. Because of this, there may be a non-zero vertical hold even when no wind is present. Note that this affects both the HUD and the Wind Card on the Range Card.
• Relative Wind (Multi): When enabled, the Wind Direction for targets is adjusted according to the difference in Azimuth between the selected target (which has a highlighted border). This allows the wind direction to be set once for the selected target and have it automatically adjusted for the other targets. This also causes the adjusted relative wind to be shown for each target in the HUD table.
• Moving Targets: When enabled, moving targets are supported. This causes the Mover Speed setting within Target section to be shown and additional Mover Speed and Mover Hold fields to be shown in the HUD. Holds for moving targets are not incorporated into the holds; only an incremental hold is shown, which must be added/subtracted to the wind hold according to direction of movement. If not in use, you may wish to turn this off to reduce clutter on the HUD.
• Show Temperature & Pressure: When enabled, Temperature and Pressure are shown in the HUD. You may wish to disable this to reduce clutter.
• Prefer MOA Fractions: When enabled, fractions (e.g., ¼) will used in the HUD in place of decimal values. This may be helpful in making turret adjustments. This setting only affects MOA-based turrets (not mil).
• Inclination & Azimuth Tool: When enabled, the internal accelerometer sensor in your device will be used in the Inclination & Azimuth Tool to determine your angle of inclination.

The following values are used to configure behavior of this app.

• Units: Select use of Imperial or Metric units.
• Use Device Pressure: When enabled, the barometric pressure in your device will be used to set the air pressure.
• Use Device Latitude: When enabled, the internal GPS sensor in your device will be used to automatically set the Latitude.
• Adjust Gravity to Location: When enabled, gravity is calculated according to latitude and altitude (as reported by device).

This is a table of lanes and targets. There can be up to 30 lanes, each with up to 5 targets. This can be used to add, edit, and delete lanes and targets.

• Select a target: Tap on a target to select it.
• Add Lane: To add a lane, press the plus (+) button in the menu.
• Add Target to Lane: To add a target to a lane, press the plus (+) button in the header for the lane. When a lane is full (5 targets), the plus button is no longer shown.
• Remove Target: To remove a target, press Edit then Delete the desired target.
• Remove Lane: Remove all targets from lane. When the last target in a lane has been remove, that lane is removes.
• Re-order Targets / Move Target to a new Lane: Press Edit, slide targets up/down to the new locations. Press Edit again to stop editing.

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This will help fix muzzle jump - vertical error with a hinting weight rifle at long range.

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Used to add to wind meter wind at you when shooting into a valley or Canyon.

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Information for the Settings Gear

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For use in PRS or multi targets lanes

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input for your rifle data point Scope Height 

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select the device in the devices tab

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allows the app to average wind speeds with a link wind meter

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Allow fast transition between tools for that section

Email, Scan or use you camera to send and receive Stages and Lanes between users as well as rifle profiles.