If you can find a good old TC Firehawk you won't be disappointed.
I put mine together from parts and it my most consistent and accurate rifle. Sabots and full calibers do very well. I think the 1-38 twist is superb for 99.99% of muzzleloading tasks.
I shoot 70 grains of 3f Swiss with:
250grain .45 Hornady XTP in a Harvester crush rib 1575fps
300 grain non- mag .45 XTP, same sabot 1500 fps
400 grain Lyman Plains, cast, SPG lube and a .54 cal o.p. wad. 1350 fps
These are chrono'd. She wears a bead foresight and aperture rear. Being a striker fired, she's also legal EVERYWHERE. .50 caliber btw.
Really SUPERB rifle.


Keepin my back green and my powder dry.
The LORD bless and keep you