Lyman makes some fine traditional Hawken and Kentucky style rifles. I'd like to suggest a 1:48 twist so you can shoot patched ball AND light weight conicals.
I have a Hawken Hunter Carbine from Cabelas (investarms) and I like it, but it took a while to figure out for me who had never fired a black powder rifle before I got this thing. You have to scrub the bore on the thing every other round, every third anyway, with a damp brush and mop dry. If you don't, the fouling ruins accuracy. It's a 1:24 twist rate which handles sabot pistol bullets and heavy Minie balls (conicals) just fine, but requires the between shot cleaning that patch round balls don't as the patch does the mopping. Of course, there is a lot to be said for hunting with a 385 grain 50 cal Minie, I just wish it wasn't such a pain of a routine at the range. LOL For hunting, though, with a traditional Hawken style firearm, it's hard to beat. It's light, chrome bore which never hurts, accurate, shoots HEAVY pills or the sabots the hunters seem to like with equal aplomb, and is good looking. I did make a modification that makes it a little more reliable and weather proof, though, a conversion to shoot small rifle magnum primers rather than No 11 caps. It was a cheap fix for the hangfires the thing liked to do with caps. I don't think these adapters are available any longer, though.