be careful on that..

if you want a bullet to tumble on impact, like what military ball ammo is designed to do, you'd better be worried you have enough momentum to carry it to the far side of the vital cavity.

on the other hand, stuff like monolithic solids are designed for maximum penetration on heavy bone structure of large, dangerous game.

personally, for my money you can't beat a good stretch and crush cavity from a perfect mushroom. Does more damage to tissues harboring mass quantities of blood vessels.