It's a challenge to get a slug down a barrel and prime it and fire a rifle and it's doubly hard to pour powder and shot into a shotgun that is not intended for muzzle loading and ram it home with a stick. Muzzle loader rifles and shotguns are cheap enough..Why not get a modern gun made for black powder?
I have muzzle loading rifles and pistols...the shotguns I found were pretty expensive. They are much more difficult to find than other BP firearms. The Pedersolis are very expensive. The Knight TK2000 is pretty high dollar too, and hard to locate.
I already had a few H&R Pardners. The Model 940E was only $100 and the adapter was like twenty bucks. The older H&R Huntsman 50 cal had push in breech plugs, and this isn't that different from that system.
Have any suggestions for affordable BP shotguns?