With most rounds that is entirely correct. I suggested the Mag-Safe and Glaser Safety Slug because they are prefragmented rounds. That is to say the round consists of a copper jacket with birdshot, in liquid teflon (poly tetra fluro ethan if you want to get technical). Plastic cap. Round hits the target, friction deccellerates the jacket, cap and contents "burst" into the target. Delivers 100% of the rounds kinetic energy into the target. Even .22 delivers the equivalent of a FMJ .45 ACP. They were originally tested on goats (about the same mass as a human) by the U.S. Army. Average time to total body death was 9 secs. Total incapacitation in under a second. It would be a rather unusual person who survives even one shot.