Not pellets, but BBs. . .
I shot a lot of BBs as a young teenager. One day, a squirrel fell out of an 80' oak in the back yard, and we noticed because the crows were starting to eat it alive. I grabbed my BB gun, with easily 3k shots fired, pumped 10, cocked, flipped over to feed from the magazine chamber. . . and it locked up. Locked hard.
I had to finish the squirrel with a spade, buried it, and then took the BB gun apart. Lo and behold, the single two-eared BB of the thousands through that gun, 5k in the jug, had jumped into the feed ramp right then. I've never seen one since. . .