I honestly don't know if anyone has yet performed a study that detailed. But I can say that this 75 gr ammunition loaded to mil-spec velocities will still be fragmenting out to as far as 300 yards. I have no idea what barrel length that is from, but probably a 14.5 M4 or a 16" AR carbine. Forest recently tested some of the NATO spec Black Hills 77 gr OTM and was getting velocities of 2820.98 fps at a distance of 10' feet from an 18" barrel. This should be very close to what the 75 gr would look like also. According to what other reliable sources have stated, it appears that the 75 gr OTM bullet can fragment at velocities as low as 2100 fps, maybe even slower. So if you can attempt to determine what point the bullet would be travelling at 2100 fps, based on the above velocities, it should put you in the ballpark.
-Charging Handle