We haven’t mentioned the Field Density Altitude Compensator for quite some time but after catching up last week with Adaptive Consulting & Training Services last week, we figured it was a good time to reacquaint you.
Adaptive Consulting & Training Services was involved in the fielding of the ballistic computer for Marine Corps Snipers. It can be a fairly complicated piece of gear and get you way off base if you end up mashing a few wrong buttons so they set out to create a more simple, analog version. The result of their efforts was the Field Density Altitude Compensator which uses the G7 drag model. They originally developed an FDAC model in .308 utilizing yards for civilian shooters, but immediately set to work on a version that worked with meters.
FDAC is easy to use, has no batteries and inexpensive enough that a LCpl can afford one. Utilizing a library of muzzle velocity specific cards, FDAC supports M118LR, .300 win mag and .338 Lapua and gives a simple density altitude model. The shooter can guess at altitude and ambient air temperature in order to find a firing solution for targets from 100-1500m. It’s as simple as knowing the muzzle velocity of your round, picking the corresponding card and inserting it into the sleeve. The solutions provided included elevation, windage, moving target lead, firing angle and spin drift.
Adaptive Consulting & Training Services has also developed a compatibility matrix for 168 grain and other projectiles on their website that will help you determine which existing card to use.
The FDAC is available through ustacticalsupply.com/fielddensityaltitudecompensator.
