Many people state a 22 is most deadly for that simple fact, it often has the power to enter, but not to leave, so it richochets inside of a skull or ribcage causing more damage than immediately exiting

This is a myth and one made up by people who don't know how firearms work. A 22lr is not going to do more damage to someone than a large caliber round... otherwise we'd be using 22lr to fight wars.

It's why it's not legal to kill anything but small game with it as well. Because it's inhumane to try and kill anything bigger than a squirrel with a 22lr.