DC-
Your questions are about traditional muzzle loaders, so this should be the proper forum. The TC Hawken is a fine rifle, as is the .45 caliber, for paper punching. You don't need a .50 or .54 for that. Most TC Hawkens come with a 1/48 twist, which will work well with patched round ball or conical. A tang mounted peep sight will increase your accuracy. The $200 price seems fair, as new ones are around $400. I would start out with round balls patched with patches lubed with a natural lube like bore butter, or pyrodex nayural lube. It will keep you fouling soft, and enable multiple shots between barrel swabbing with good accuracy. Experiment with patch thickness and powder charges for best accuracy. I like Pyrodex RS, as I think it burns a little cleaner then regular black powder. Good luck
Larry