The .25-20 will tear a pretty good sized hole in a squirrel. I try to shoot them in the head, but sometimes when they run, I don't lead them enough and they go a bit too far back. That's one reason you see tails, cause the carcasses were a bit too mangled for pictures!
Don't let anyone tell you that you can't easily plug a 100 lb. whitetail with a .25-20, though. Center them in the lungs at 50 yards and its enough bullet and enough gun.
