Doesnt seem to matter which round is used but a lot of the time if you fire into someones chest it ruins everything in their vest, jacket and backpack.

Fair enough with maybe the 7.62 or the .308 but 9mm?!

...And would one bullet ruin EVERYTHING?!?! which has happened to myself and friends plenty of times, sometimes removing people all together out of a gunfight because all their ammo is ruined and cant be sorted.