I have a new one in 50 cal have never shot it a friend has one in 54 and he uses the buffalo bullets in his. I changed out the composit stock with a nice walnut one from a black mountain and it looks great.
I believe the twist is 1-28 but you can go on TC web site to get twist rate for all their barrels. I saw a 54 at last gun show very vice and only 150.00 and I saw one at a local pawn for 165.00 and also saw a fellow at one of the gun shows with one very nice with a tang peep for 175.00. I really like mine, just have never had a chance to shoot it, seem to be well made and with TC lifetime how can you go wrong.
Deaconllb