I had a Remington 510 single shot "shotgun" like the one in the photo when I was a kid. We used it to kill "English sparrows" (which aren't especially English and certainly not sparrows....), bluejays, starlings and house finchs that raided our fruit orchard. Would also work on rats and ground squirrels at close range (Bowie knife close!). I was aware that it was intended to shoot small skeets from ads in "Boys Life", but didn't know much more than that. (Nobody I knew could afford to shoot the full-sized clays, let alone tiny ones). After shooting "songbirds" became less-than-legal, I sold it to a Remington collector (a scrub jay is a SONG bird????). I suspect that the majority of these .22 smoothbores never were fired at a clay--mainly pest control. At any distance the .22 shot won't penetrate iron roofing sheets (but a .410 will...) don't know about the new-fangled aluminium ones.
