Hello, not sure if this is the correct forum.I am considering purchasing a 12 gauge single shot break open shotgun. I mostly have experience with muzzleloaders and am wondering what type of cartridge to shoot in this shotgun.The patent number stamped in reciever reads (FEBY 4 1896).Thanks for any advise or help.

You are in the rifle section. Post this question in the main forum at the top of the index. Pictures help. Pictures of the proof marks help a lot more. Description of condition of the barrels? Mirror? Shiny? Pitted and rusty? Choke? Chamber?