I have a Remington Ultimate Muzzleloader (.50) that I bought new at Sportsman's Warehouse in October 2019.  Shot a few range sessions with it and decided I didn't love it.  Shoots well with three 777 50 gr pellets.  I have the original case and a pack of primer shells and bullet/sabots that go with it.  It has the Bell & Carlson stock.  I live in Tucson. Shoot me a PM if you are interested.