ATragMX setup: drop truing

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The FM outlines our core skills, policies and guides to ensure every member stands ready for the mission ahead.

Introduction

Atmospheric drag of any object in motion is not a fixed value, rather it changes significantly depending on speed. The transition from supersonic to subsonic velocities in particular can produce a vast difference in atmospheric drag, which becomes a relevant consideration for sniper teams engaging at extended distances.

The singular C1 ballistic coefficient provided by the arsenal (measured at the muzzle) only accurately accounts for close and moderate distances.

To ensure accurate bullet drop at all ranges, we will need three data points input into our ATragMX:

1. The starting C1 ballistic coefficient per FM/BG-562 - ATragMX setup: C1 ballistic coefficient
2. The C1 ballistic coefficient at a transonic range
3. The C1 ballistic coefficient at a subsonic range

Fortunately, the ATragMX will provide us with the additional data, all we need to do is take shots at prescribed ranges and input the bullet drop.

Resetting the Drag Coefficient Table

The ATragMX may autogenerate a ballistic coefficient table. We will clear this to ensure accurate manual entry.

To open the Drag Coefficient Table, Options > Drag Coef Table

• Press “Clear”
• Press “Done”

Transonic Ballistic Coefficient

To open the drop truing tool, Options > Truing Drop.

• Press “Restore”
  • The Target Range distance under the “Super” Column will be auto-populated with the transonic distance.
• In Eden, set a target at this distance and record the actual bullet drop.
• Enter the auto-populated transonic distance in the “Sub” target distance column
  • Press "Calc" to recalibrate fields.
• Enter the recorded drop value in the “Drop” field, still in the “Sub” column.
  • Press "Calc" to generate a new ballistic coefficient.
• Press “Accept” to auto-populate this number into the BC Table.

Subsonic Ballistic Coefficient

To open the drop truing tool, Options > Truing Drop.

• Press “Restore”
  • The Target Range distance under the “Sub” Column will be auto-populated with the subsonic distance.
• In Eden, set a target at this distance and record the actual bullet drop.
• Press “Restore” to ensure the auto-populated subsonic distance is accurate.
• Enter the recorded drop value in the “Drop” field under the “Sub” column.
  • Press "Calc" to generate a new ballistic coefficient.
• Press “Accept” to auto-populate this number into the BC Table.

Above: AtragMX Truing Drop tool screen

Published by Maj James on 05/07/2024 at 20:11

Introduction

Atmospheric drag of any object in motion is not a fixed value, rather it changes significantly depending on speed. The transition from supersonic to subsonic velocities in particular can produce a vast difference in atmospheric drag, which becomes a relevant consideration for sniper teams engaging at extended distances.

The singular C1 ballistic coefficient provided by the arsenal (measured at the muzzle) only accurately accounts for close and moderate distances.

To ensure accurate bullet drop at all ranges, we will need three data points input into our ATragMX:

1. The starting C1 ballistic coefficient per FM/BG-562 - ATragMX setup: C1 ballistic coefficient
2. The C1 ballistic coefficient at a transonic range
3. The C1 ballistic coefficient at a subsonic range

Fortunately, the ATragMX will provide us with the additional data, all we need to do is take shots at prescribed ranges and input the bullet drop.

Resetting the Drag Coefficient Table

The ATragMX may autogenerate a ballistic coefficient table. We will clear this to ensure accurate manual entry.

To open the Drag Coefficient Table, Options > Drag Coef Table

• Press “Clear”
• Press "Done"

Transonic Ballistic Coefficient

To open the drop truing tool, Options > Truing Drop.

• Press “Restore”
  • The Target Range distance under the “Super” Column will be auto-populated with the transonic distance.
• In Eden, set a target at this distance and record the actual bullet drop.

• Enter the auto-populated transonic distance in the “Sub” target distance column
  • Press "Calc" to recalibrate fields.
• Enter the recorded drop value in the “Drop” field, still in the “Sub” column.
  • Press "Calc" to generate a new ballistic coefficient.
• Press “Accept” to auto-populate this number into the BC Table.

Subsonic Ballistic Coefficient

To open the drop truing tool, Options > Truing Drop.

• Press “Restore”
  • The Target Range distance under the “Sub” Column will be auto-populated with the subsonic distance.
• In Eden, set a target at this distance and record the actual bullet drop.

• Press “Restore” to ensure the auto-populated subsonic distance is accurate.
• Enter the recorded drop value in the “Drop” field under the “Sub” column.
  • Press "Calc" to generate a new ballistic coefficient.
• Press “Accept” to auto-populate this number into the BC Table.

Above: AtragMX Truing Drop tool screen

Published by SFC mbaker5114 on 01/07/2024 at 02:34

Introduction

Atmospheric drag of any object in motion is not a fixed value, rather it changes significantly depending on speed. The transition from supersonic to subsonic velocities in particular can produce a vast difference in atmospheric drag, which becomes a relevant consideration for sniper teams engaging at extended distances.

The singular C1 ballistic coefficient provided by the arsenal (measured at the muzzle) only accurately accounts for close and moderate distances.

To ensure accurate bullet drop at all ranges, we will need three data points input into our ATragMX:

1. The starting C1 ballistic coefficient per FM/BG-562 - ATragMX setup: C1 ballistic coefficient
2. The C1 ballistic coefficient at a transonic range
3. The C1 ballistic coefficient at a subsonic range

Fortunately, the ATragMX will provide us with the additional data, all we need to do is take shots at prescribed ranges and input the bullet drop.

Resetting the Drag Coefficient Table

The ATragMX may autogenerate a ballistic coefficient table. We will clear this to ensure accurate manual entry.

To open the Drag Coefficient Table, Options > Drag Coef Table

• Press “Clear”
• Press "Done"

Transonic Ballistic Coefficient

To open the drop truing tool, Options > Truing Drop.

• Press “Restore”
  • The Target Range distance under the “Super” Column will be auto-populated with the transonic distance.
• In Eden, set a target at this distance and record the actual bullet drop.

• Enter the auto-populated transonic distance in the “Sub” target distance column
  • Press "Calc" to recalibrate fields.
• Enter the recorded drop value in the “Drop” field, still in the “Sub” column.
  • Press "Calc" to generate a new ballistic coefficient.
• Press “Accept” to auto-populate this number into the BC Table.

Subsonic Ballistic Coefficient

To open the drop truing tool, Options > Truing Drop.

• Press “Restore”
  • The Target Range distance under the “Sub” Column will be auto-populated with the subsonic distance.
• In Eden, set a target at this distance and record the actual bullet drop.

• Press “Restore” to ensure the auto-populated subsonic distance is accurate.
• Enter the recorded drop value in the “Drop” field under the “Sub” column.
  • Press "Calc" to generate a new ballistic coefficient.
• Press “Accept” to auto-populate this number into the BC Table.

Above: AtragMX Truing Drop tool screen

Published by SFC mbaker5114 on 01/07/2024 at 02:20

Introduction

Atmospheric drag of any object in motion is not a fixed value, rather it changes significantly depending on speed. The transition from supersonic to subsonic velocities in particular can produce a vast difference in atmospheric drag, which becomes a relevant consideration for sniper teams engaging at extended distances.

The singular C1 ballistic coefficient provided by the arsenal (measured at the muzzle) only accurately accounts for close and moderate distances.

To ensure accurate bullet drop at all ranges, we will need three data points input into our ATragMX:

1. The starting C1 ballistic coefficient per FM/BG-562 - ATragMX setup: C1 ballistic coefficient
2. The C1 ballistic coefficient at a transonic range
3. The C1 ballistic coefficient at a subsonic range

Fortunately, the ATragMX will provide us with the additional data, all we need to do is take shots at prescribed ranges and input the bullet drop.

Transonic Ballistic Coefficient

To open the drop truing tool, Options > Truing Drop.

• Press “Restore”
  • The Target Range distance under the “Super” Column will be auto-populated with the transonic distance.
• In Eden, set a target at this distance and record the actual bullet drop.

• Enter the auto-populated transonic distance in the “Sub” target distance column
  • Press "Calc" to recalibrate fields.
• Enter the recorded drop value in the “Drop” field, still in the “Sub” column.
  • Press "Calc" to generate a new ballistic coefficient.
• Press “Accept” to auto-populate this number into the BC Table.

Subsonic Ballistic Coefficient

To open the drop truing tool, Options > Truing Drop.

• Press “Restore”
  • The Target Range distance under the “Sub” Column will be auto-populated with the subsonic distance.
• In Eden, set a target at this distance and record the actual bullet drop.

• Press “Restore” to ensure the auto-populated subsonic distance is accurate.
• Enter the recorded drop value in the “Drop” field under the “Sub” column.
  • Press "Calc" to generate a new ballistic coefficient.
• Press “Accept” to auto-populate this number into the BC Table.

Above: AtragMX Truing Drop tool screen

Published by SFC mbaker5114 on 01/07/2024 at 02:17

Introduction

Atmospheric drag of any object in motion is not a fixed value, rather it changes significantly depending on speed. The transition from supersonic to subsonic velocities in particular can produce a vast difference in atmospheric drag, which becomes a relevant consideration for sniper teams engaging at extended distances.

The singular C1 ballistic coefficient provided by the arsenal (measured at the muzzle) only accurately accounts for close and moderate distances.

To ensure accurate bullet drop at all ranges, we will need three data points input into our ATragMX:

1. The starting C1 ballistic coefficient per FM/BG-562 - ATragMX setup: C1 ballistic coefficient
2. The C1 ballistic coefficient at a transonic range
3. The C1 ballistic coefficient at a subsonic range

Fortunately, the ATragMX will provide us with the additional data, all we need to do is take shots at prescribed ranges and input the bullet drop.

Transonic Ballistic Coefficient

To open the drop truing tool, Options > Truing Drop.

• Press “Restore”
  • The Target Range distance under the “Super” Column will be auto-populated with the transonic distance.
• In Eden, set a target at this distance and record the actual bullet drop.

• Press “Calc”
• Press “Accept”

These three targeted data points will allow accurate and automatic ballistic coefficient adjustments through the entire range of the weapon system.

Above: AtragMX Truing Drop tool screen

Published by SFC mbaker5114 on 01/07/2024 at 02:05

Introduction

Atmospheric drag of any object in motion is not a fixed value, rather it changes significantly depending on speed. The transition from supersonic to subsonic velocities in particular can produce a vast difference in atmospheric drag, which becomes a relevant consideration for sniper teams engaging at extended distances. For this reason, relying on the singular C1 ballistic coefficient provided by the arsenal (typically measured at the muzzle) only accurately accounts for close and moderate distances.

To produce accurate drop values at extended and maximum distances, we must use the drop truing tool to gather additional information.

Data Collection

To ensure accurate bullet drop at all ranges, we will need to enter the Eden Editor and shoot our rifle/scope combination at three distances:

1. The distance the gun is zeroed at
2. The furthest distance on the range card with a populated value (at 15°C)
3. A distance 250 or 300m beyond the range card values (at 15°C)

At each distance, record the vertical adjustment required for a centered impact. These adjustment values will be input into the drop truing tool.

Drop Truing Tool

To open the drop truing tool, Options > Truing Drop.

• Select “Super” or “Sub” as appropriate
  • Shot 1 will travel at supersonic speeds, and should use “super”
  • Shot 2 & 3 will travel at subsonic speeds, and should use “sub”
• Input "Target Range"
• Input recorded vertical adjustment in "Drop"
• Press “Calc”
• Press “Accept”

Repeat this process for all three shots fired and recorded. These three targeted data points will allow accurate and automatic ballistic coefficient adjustments through the entire range of the weapon system.

Above: AtragMX Truing Drop tool screen

Published by SFC mbaker5114 on 23/06/2024 at 21:17

Introduction

Atmospheric drag of any object in motion is not a fixed value, rather it changes significantly depending on speed. The transition from supersonic to subsonic velocities in particular can produce a vast difference in atmospheric drag, which becomes a relevant consideration for sniper teams engaging at extended distances. For this reason, relying on the singular C1 ballistic coefficient provided by the arsenal (typically measured at the muzzle) only accurately accounts for close and moderate distances.

To produce accurate drop values at extended and maximum distances, we must use the drop truing tool to gather additional information.

Data Collection

To ensure accurate bullet drop at all ranges, we will need to enter the Eden Editor and shoot our rifle/scope combination at three distances:

1. The distance the gun is zeroed at
2. The furthest distance with a populated value on the range card (at 15°C)
3. A distance 250 or 300m further than the range card populates (at 15°C)

At each distance, record the vertical adjustment required for a centered impact. These adjustment values will be input into the drop truing tool.

Drop Truing Tool

To open the drop truing tool, Options > Truing Drop.

• Select “Super” or “Sub” as appropriate
  • Shot 1 will travel at supersonic speeds, and should use “super”
  • Shot 2 & 3 will travel at subsonic speeds, and should use “sub”
• Input "Target Range"
• Input recorded vertical adjustment in "Drop"
• Press “Calc”
• Press “Accept”

Repeat this process for all three shots fired and recorded. These three targeted data points will allow accurate and automatic ballistic coefficient adjustments through the entire range of the weapon system.

Above: AtragMX Truing Drop tool screen

Published by SFC mbaker5114 on 23/06/2024 at 21:16

Introduction

Atmospheric drag of any object in motion is not a fixed value, rather it changes significantly depending on speed. The transition from supersonic to subsonic velocities in particular can produce a vast difference in atmospheric drag, which becomes a relevant consideration for sniper teams engaging at extended distances. For this reason, relying on the singular C1 ballistic coefficient provided by the arsenal (typically measured at the muzzle) only accurately accounts for close and moderate distances.

To produce accurate drop values at extended and maximum distances, we must use the drop truing tool to gather additional information.

Data Collection

To ensure accurate bullet drop at all ranges, we will need to enter the Eden Editor and shoot our rifle/scope combination at three distances:

1. The distance the gun is zeroed at
2. The furthest distance with a populated value on the range card (at 15°C)
3. A distance 250 or 300m further than the range card populates (at 15°C)

At each distance, record the vertical adjustment required for a centered impact. These adjustment values will be input into the drop truing tool.

Drop Truing Tool

To open the drop truing tool, Options > Truing Drop.

• Select “Super” or “Sub” as appropriate
  • Shot 1 will travel at supersonic speeds, and should use “super”
  • Shot 2 & 3 will travel at subsonic speeds, and should use “sub”
• Input "Target Range"
• Input recorded vertical adjustment in "Drop"
• Press “Calc”
• Press “Accept”

Above: AtragMX Truing Drop tool screen

Published by SFC mbaker5114 on 23/06/2024 at 21:14

Introduction

Atmospheric drag of any object in motion is not a fixed value, rather it changes significantly depending on speed. The transition from supersonic to subsonic velocities in particular can produce a vast difference in atmospheric drag, which becomes a relevant consideration for sniper teams engaging at extended distances. For this reason, relying on the singular C1 ballistic coefficient provided by the arsenal (typically measured at the muzzle) only accurately accounts for close and moderate distances.

To produce accurate drop values at extended and maximum distances, we must use the drop truing tool to gather additional information.

Data Collection

To ensure accurate bullet drop at all ranges, we will need to employ the drop truing tool at three distances:

1. The distance the gun is zeroed at
2. The furthest distance with a populated value on the range card (at 15°C)
3. A distance 250 or 300m further than the range card populates (at 15°C)

At each distance, record the vertical adjustment required for a centered impact. This 

To know the real C1 coefficient of any gun and bullet, you’ll need to (before the mission) use the Eden Editor to place yourself on a firing range and use the Truing Drop Tool of the AtragMX.

• First, place a target very far from yourself (1600-2000m). Calculate a firing solution using the relevant guides and fire one shot. You’ll notice that the bullet will fall one or two milli-rads more than expected.
• Now, open AtragMX > Options > Truing Drop
• In the Range / Super field, input the target range and press Calc. The Drop / Super field should now display the elevation of the firing solution. 
• Do the same for the Range / Sub field. 
• Finally, in the Drop / Sub field input the correct elevation (add the number of mils your bullet fell when you shot earlier) and press Calc. 
• The bottom section will now display the correct C1 coefficient.

Above: AtragMX Truing Drop tool screen

Published by SFC mbaker5114 on 23/06/2024 at 21:03

Atmospheric drag of any object is not a hard fixed value, it changes depending on speed. In particular, it can change dramatically depending on whether an object is moving at supersonic or subsonic velocities.

For this reason, the C1 coefficient you have saved for a bullet can be inaccurate. If for some reason a mission will require you to hit a target at subsonic ranges (usually 1,500m or greater for most weapons), this change in drag may be relevant.

To know the real C1 coefficient of any gun and bullet, you’ll need to (before the mission) use the Eden Editor to place yourself on a firing range and use the Truing Drop Tool of the AtragMX.

• First, place a target very far from yourself (1600-2000m). Calculate a firing solution using the relevant guides and fire one shot. You’ll notice that the bullet will fall one or two milli-rads more than expected.
• Now, open AtragMX > Options > Truing Drop
• In the Range / Super field, input the target range and press Calc. The Drop / Super field should now display the elevation of the firing solution. 
• Do the same for the Range / Sub field. 
• Finally, in the Drop / Sub field input the correct elevation (add the number of mils your bullet fell when you shot earlier) and press Calc. 
• The bottom section will now display the correct C1 coefficient.

Above: AtragMX Truing Drop tool screen

Published by SFC mbaker5114 on 17/06/2024 at 21:26

Atmospheric drag of any object is not a hard fixed value, it changes depending on speed. In particular, it can change dramatically depending on whether an object is moving at supersonic or subsonic velocities.

For this reason, the C1 coefficient you have saved for a bullet can be inaccurate. If for some reason a mission will require you to hit a target at subsonic ranges (usually 1,500m or greater for most weapons), this change in drag may be relevant.

To know the real C1 coefficient of any gun and bullet, you’ll need to (before the mission) use the Eden Editor to place yourself on a firing range and use the Truing Drop Tool of the AtragMX.

• First, place a target very far from yourself (1600-2000m). Calculate a firing solution using the relevant guides and fire one shot. You’ll notice that the bullet will fall one or two milli-rads more than expected.
• Now, open AtragMX > Options > Truing Drop
• In the Range / Super field, input the target range and press Calc. The Drop / Super field should now display the elevation of the firing solution. 
• Do the same for the Range / Sub field. 
• Finally, in the Drop / Sub field input the correct elevation (add the number of mils your bullet fell when you shot earlier) and press Calc. 
• The bottom section will now display the correct C1 coefficient.

Above: AtragMX Truing Drop tool screen

Published by MSP Mohawk on 20/05/2024 at 18:29

Atmospheric drag of any object is not a hard fixed value, it changes depending on speed. In particular, it can change dramatically depending on whether an object is moving at supersonic or subsonic velocities.

For this reason, the C1 coefficient you have saved for a bullet can be inaccurate. If for some reason a mission will require you to hit a target at subsonic ranges (usually 1,500m for most weapons), this change in drag may be relevant.

To know the real C1 coefficient of any gun and bullet, you’ll need to (before the mission) use the Eden Editor to place yourself on a firing range and use the Truing Drop Tool of the AtragMX.

• First, place a target very far from yourself (1600-2000m). Calculate a firing solution using the relevant guides and fire one shot. You’ll notice that the bullet will fall one or two milli-rads more than expected.
• Now, open AtragMX > Options > Truing Drop
• In the Range / Super field, input the target range and press Calc. The Drop / Super field should now display the elevation of the firing solution. 
• Do the same for the Range / Sub field. 
• Finally, in the Drop / Sub field input the correct elevation (add the number of mils your bullet fell when you shot earlier) and press Calc. 
• The bottom section will now display the correct C1 coefficient.

Above: AtragMX Truing Drop tool screen

Published by MSP Mohawk on 01/05/2024 at 14:49

Atmospheric drag of any object is not a hard fixed value, it changes depending on speed. In particular, it can change dramatically depending on whether an object is moving at supersonic or subsonic velocities.

For this reason, the C1 coefficient you have saved for a bullet can be inaccurate. If for some reason a mission will require you to hit a target at subsonic ranges (usually 1,500m for most weapons), this change in drag may be relevant.

To know the real C1 coefficient of any gun and bullet, you’ll need to (before the mission) use the Eden Editor to place yourself on a firing range and use the Truing Drop Tool of the AtragMX.

• First, place a target very far from yourself (1600-2000m). Calculate a firing solution using the relevant guides and fire one shot. You’ll notice that the bullet will fall one or two milli-rads more than expected.
• Now, open AtragMX > Options > Truing Drop
• In the Range / Super field, input the target range and press Calc. The Drop / Super field should now display the elevation of the firing solution. 
• Do the same for the Range / Sub field. 
• Finally, in the Drop / Sub field input the correct elevation (add the number of mils your bullet fell when you shot earlier) and press Calc. 
• The bottom section will now display the correct C1 coefficient.

Published by MSP Mohawk on 01/05/2024 at 14:39