A hollow tipped bullet. On impact they fold back (looking like a mushroom) either producing a huge exit wound or ripping up as many organs and muscle as possible.
also see: hydra shok

Brazilian butt lift

A Bullet in which the tip is hollow, mostly used for killing, because on impact the hollow tip makes the bullet spread like shrapnal to insure maximum dammage.

hollow tips are a type of bullet the kill eficiently and fast

A bullet that you can shoot someone in the foot and its gonna wind up coming through their spine. Shoot somone in the stomach and it will swirl around in a sircle for a while. Nasty stuff.