I had a uncle in NE Oklahoma that told this for the absolute truth.
Some fellars came from Tulsa to hunt quails on an older guys place, and some surrounding neighbors. The old gent gave them permission and they asked if he would like to go along. He said sure, he'd get his coat and gun. They told him they would furnish the ammo, but he told them they didn't have ammo for his gun. He came back out with a Winchester pump 22. They told him they hunted over dogs and flushed the birds, shot 'em in the air. He said he knew how to hunt birds, been doin' it most of his life. Unc said they got into several coveys, got in a lot of shooting. The Tulsa boys could hear the 22 say "pat!" every once in a while, and thought it was pretty funny. When they got back to the old gent's house they offered to divvy up the birds with him. He told them he only wanted the ones that he had shot. They poured them out on the porch and he went to digging through the pile of birds, setting one to the side here and there as he looked. I can't remember how many Unc said the old guy had, but the Tulsa boys wanted to know how he was so sure which ones were his. He turned them over and showed the guys that EVERY ONE of them in his pile was shot through the back of the head with a 22!! Turned out he had been an exhibition shooter for Winchester for years.