Re: FDAC or Mildot Master?
the FDAC in a nutshell takes the three environmental conditions that affect exterior ballistics bullet flight, combine them into one dataset (DENSITY ALTITUDE), and using modern ballistics , coupled with good old fashioned slide ruler functionality, you get cards that have come-up(scope adjustments) and windage adjustments in 50 yard steps all the way to 1000yds or meters for 308 175 grain bullets at 2600fps, 2650 fps or 2700 fps
manual slide ruler, no batteries required fits in your pocket
the FDAC is well worth every penny, especially for shooters using issued or factory ammo (mil/LE )
the MIL DOT MASTER , is a range estimation slide ruler; with a mildot picture showing mil radian bracket steps/sizes, ranges in yards or meters (have to buy the proper card insert) for a known target size that you are ranging using your MIL DOT optic
it also can be setup to use as a slant angle estimator for angle fire
scenario is , you with your rifle, see a man sized target in the distance; you use your mil-dot scope to estimate how many mils the target is in your scope, then using the MILDOT MASTER you slide the card down to the mil increment the target is, which then gives you the range to that target in yards .. . then pick up your FDAC and using the density altitude estimator graph on side one, you estimate density altitude, then sliding the card to that density altitude figure say (+)3,000ft you look at the closest yardage figure your target is at and read what the scope adjustment is for that yardage; apply that to your optic, adjust for wind, apply the shooting fundamentals, BRASSF (breath, relax, stop, squeeze, follow through) and watch your target fall
other tools do these same things - but many rely on batteries, or are multiple devices that these MANUAL slide rulers combine, making them either a good redundant shooting resource or a great primary resource ;
hope that helps
