Posted by BLU: I've had a lot of people say the .22 Short would just ricochet off someone's skull. Uh, I don't think so. Not after doing this in a 2x4!!
Surely you did not need that demonstration to make you realize that a .22 Short can be extremely dangerous, and even lethal. Be careful with that thing.
Heck, in the old days, .22 Shorts, well-placed, of course, were routinely used by farmers to kill pigs. They'll do it reliably.
Even spring-powered pellets have killed people.
That
does not mean that anyone in his right mind should consider even for a moment relying upon an air pistol or a firearm using an extremely weak cartridge for self defense. As has already been hashed out in several recent threads, there is a considerable body of knowledge on the subject of would wounding effectiveness and on the necessary thresholds of penetration for prudent self defense. Bullets from a self defense weapon may have to penetrate both the ulna and the radius, a rib, several layers of clothing, and several inches of flesh, and still have the residual kinetic energy to destroy something vital. One cannot count on an attacker presenting his unobstructed face to you as a target.
Back to the subject of ricochets: most, but not all, ricochets occur when a projectile strikes a hard surface at a small acute angle. Bullets ricochet off of water, hard ground, foundation walls, fences, pipes, tractor drawbars, and yes, even skulls. There are even cases in which 9mm bullets have failed to penetrate human skulls. Depends a lot on the angle of impact.
Years ago, a friend decided to test a reproduction .41 Deringer muzzle loader in his basement. His back-stop consisted of newspapers and telephone books. As an additional margin of safety, he decided, unwisely, to put a piece of plywood on the face of the backstop.
The round ball bounced right off the plywood and stuck him in the chest, causing heavy bruising. Had it srtuck him in a different place, it could have killed him.