I have a 54 cal muzzleloader, I was wondering if it could be bored out and made into a muzzy shotgun. I tried google and got no where. I did not mic the barrel and wouldnt come close to know what the tolerances would be for allowance. Just a thought, I am not home right now so have no idea. Was hoping I could make it into a 20 gauge. But may not be enough meat left to do that. And a 410 might allready be smaller than a 54 cal.