cachsux
Wah
That's not exactly true. I don't know very much at all about guns or ammo, but I do know that the design of a hollow point bullet is so that upon impact it will flatten out and fragment within the target and not travel through the victim. However, even that is something I have heard about and would be willing to learn differently.
You're getting two different bullet designs combined in your thoughts.
A hollow point bullet will "mushroom" when it enters increasing tissue damage and also transferring maximum kinetic energy to the target.
A bullet designed to tumble will enter a target and go end for end creating an elongated tunnel through the target.