Saw an article yesterday, I believe it was in American Shooter, about the shotguns of England. They talked about the 4 Bore and how it is still used in England. Any gun of .50 caliber is banned for civilians in the US so the 10 guage is as big as we'll see. The guy in the article has built a custom 1 Bore magnum. They show a picture of the shell he is stuffing in it, it looks like a stick of dynomite, and yes these guns are fired from the shoulder, pics are in the magazine.