Not only has the 9mm NATO FMJ round shown the bleeding and pain wont stop a person, look at the problems faced by the U.S. over a hundred years ago in the Philippine Insurrection. Soldiers with the New Army Revolver in 38 Long Colt put a whole cylinder of rounds into some Moros that just kept coming and would hack them with swords and Kris daggers before dropping dead. This experience brought about the development of the 45acp as a big heavy bullet was the best they could do in the age before JHP ammo.