Adaptive Field Density Altitude Compensator

Details

• Displays elevation & windage firing solutions using density altitude
• Includes 12 ballistic cards for ..300WM & .338LM in most common velocity range
• Correction in MOA or MILS

Specifications

This product was entirely conceived, designed, and validated by Adaptive Consulting & Training Services, LLC (ACTS). ACTS is a small business completely owned and operated by former USMC Scout Snipers.

The MILSPEC-XR FDAC is an analog slide rule that displays elevation and windage firing solutions using density altitude (DA). It has two sides, side (A) calculates firing solutions in MOA (minutes of angle) and side (B) calculates in 0.1 MRAD (one tenth milradian, commonly referred to as “mils”). The front of the product has a density altitude calculation table, allowing the user to easily compute density altitude with acceptable accuracy in the absence of an instrument such as a kestrel or other device that measures density altitude.

Compute a firing solution and hit your target in a fraction of the time needed to operate any ballistic computer in a field environment! Features:

• Calculates firing solutions in 0.1 MRAD increments from 100-1500 meters.
• Compensates for elevation, windage, moving target leads, firing angle, and spin drift.
• User adjustable Density Altitude from -2,000' to +16,000'.
• Marked sonic barrier crossing, specific to the user's selected density altitude.
• Uses the modern G7 drag model for all firing solutions and Brian Litz's extensively tested G7 ballistic coefficients.
• 12 slides are included in the system supporting both .300 Winchester Magnum and the .338 Lapua Magnum cartridges.

12 Slides included with each MILSPEC-XR FDAC:

.300 Winchester Magnum

• MK248 MOD 0 - 190gn Sierra MatchKing - Muzzle Velocities: 2900, 2950, 3000 fps (3 slides)
• MK248 MOD 1 - 220gn Sierra MatchKing - Muzzle Velocities: 2800, 2850, 2900 fps (3 slides)

.338 Lapua Magnum

• 250gn Lapua Scenar - Muzzle Velocities: 2900-2950-3000 fps (3 slides)
• 300gn Lapua Scenar - Muzzle Velocities: 2700-2750-2800 fps (3 slides)

The user simply inserts the slide which is the closest to the muzzle velocity of his rifle, and then slides the internal firing solution matrix (the slide) until the current density altitude and the below listed firing solutions are visible in the viewing window. All firing solutions contained in the MILSPEC-XR FDAC are calculated using the G7 drag model and Bryan Litz’s tested G7 ballistic coefficients.

You will notice that the case and internal slides are different colors on each side (tan/green), this is to ensure that the user has inserted the slide into the case properly. If the slide and case colors match as seen through the viewing window, the slide has been inserted properly and the user is now reading the proper scope adjustment increments (MOA/0.1 MRAD), there are also visible markings on the pull tabs of the slide for redundancy. 

Windage figures listed on the MILSPEC-XR FDAC are based on a 5mph full value “baseline” wind, allowing the shooter to easily multiply or divide this baseline as winds increase or decrease in velocity, or the wind value (wind angle) changes from perpendicular to the axis of fire (which would be a full value wind).

The sonic barrier is marked in red on each slide to indicate at a given density altitude, target distance, and muzzle velocity the point in which the projectile will begin and maintain sub-sonic flight. This was found to be very helpful for shooters engaging long range targets in very dense air in which their projectiles would become unstable and possibly unpredictable in flight.

During the verification/validation phase we used shooters from a very wide range of experience levels. On every occasion, young shooters with very little shooting experience and ballistic knowledge were pitted against experienced shooters operating complex, PDA and cell phone operated ballistic computers. In every test, the shooter operating the MILSPEC-XR FDAC was able to get "on target" long before the experienced shooter was able to even finish inputing data within the ballistic computer.

This product is not designed to replace a ballistic computer. The MILSPEC-XR FDAC is primarily designed to augment a ballistic computer in the event of system failure, or when an accurate shot has to be delivered immediately without time to operate a ballistic computer.

The MILSPEC-XR FDAC is entirely made in the UNITED STATES OF AMERICA. It is completely waterproof, no paper or cardboard is used at all. It is constructed out of very rugged and flexible PVC and is designed specifically for a sniper operating in the field.