I looked into them before. The problem is no way to get a shot cup down the tube in a tapered barrel. I know some ML hunters go old school and use lead shot on a wad right against the bore and a wad on top. I watched a video using one of those adapters on a full choke gun and they ended up stuffing news paper down the barrel for wads. It can work but will never work like a regular muzzleloader shotgun.
