difficult one this ive never done it myself, but i did sit and watch a myth buster programe on it, they worked out that a 308 bullet fired in the air, came back to earth with a terminal velocity of just over 100 mph and proved that that wasnt enough to even break the skin of a pig carcass, and if you watch all the news programs showing people in other countrys shooting ak47s in the air why are people not dropping dead everywhere???