Well you really wouldnt be able to easily tell by bullet flight time. Depending on what bullet weight they are using, I believe milsurp ranges from 150ish grains all the way to over 200, the muzzle velocity will be widely different.
The best method would be to measure the time from bullet impact to when you hear the hit. Sound travels somewhere around 1050-1100 FPS depending on a crap load of variables. From what I was able to measure watching and using the stop watch on my phone it looked like a little under 1.5 seconds, which could be right around 500 yards.
C co 1/30th Infantry Regiment
3rd Brigade 3rd Infantry Division
2002-2006
OIF 1 and 3
IraqGunz:
No dude is going to get shot in the chest at 300 yards and look down and say "What is that, a 3 MOA group?"
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