Around here, I recall folks back in the 60's making cut shells for impromptu poaching. They'd go out bird hunting in the fall and carry a few cut shells in case they jumped a deer at close range.
It was illegal to carry buckshot or slugs in the woods when deer season wasn't open, so I guess they figured this was a way to skirt the law. I thought it was dumb, since I think a game warden would have figured out what they were up to if they found someone carrying them.
I never saw one fired, but I knew of people who carried them.