Adaptive Field Density Altitude Compensator

Details

• Displays elevation & windage firing solutions using density altitude
• Includes 5 ballistic cards for .308 in most common velocity range
• Correction in MOA or MILS
• Meters

Specifications

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:

• Trajectory and windage solutions equal to modern ballistic computers
• Non-tech! No batteries, extremely durable, incredibly small and lightweight
• Firing solutions for a wide range of density attitude (-3,000’ to +10,000’)
• Extremely accurate density altitude calculation table
• All firing solutions are based on the modern G7 drag model
• User adjustable muzzle velocity
• Marked sound barrier crossing for extreme range targets
• Designed for use with all MOA and MRAD adjusting optics. 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 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.

The FDAC comes with (5) internal slides which can be swapped out by the user. Each slide contains ballistic data specific to the most common velocity range used with the 175 Sierra Matching

• 2500 fps
• 2550 fps
• 2600 fps
• 2650 fps
• 2700 fps

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 FDAC are calculated using the G7 drag model and Bryan Litz’s tested G7 ballistic coefficients. All data contained in the three slides are the results of an extensive two year live fire testing and validation project involving several military snipers, about 20 different weapon/optic combinations, and about 20,000 rounds of .308 ammunition fired in numerous environments around the world. The production version has gone through several revisions, ultimately yielding a very simple, accurate, and user friendly tool for anyone that owns or is issued a .308 Winchester / 7.62 x 51mm precision rifle.

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.
All ranges listed on the FDAC are in Meters and are in 50 meter increments up to 800 Meters. From 800-1,000 meters all range increments are listed in 25 meter increments, providing the user with a much more refined firing solution for very distant targets (greater than 800 meters).

Windage figures listed on the 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 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 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 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. If you own a .308 this product is for you!