Actually, a .22 short shot through the head is a better way to kill a squirrel. Picking shotgun pellets out of a squirrel is not fun, nor is chomping down on the pellet(s) you've inevitably missed while eating squirrel stew. That means not only several unpleasant trips to the dentist but a lot of money out of pocket!
_________________________
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey