Do NOT get a 1/48 twist! This is a compromise between conical and round which shoots 6 " groups of anything in all three of my rifles (all 1/48 -TC .50 Hawkin, TC 45 Seneca, Cabelas .45). Decide between conicals or round, and get the proper twist rate for it. And 1/48 IMO isn't!!!
Off the top of my head I believe it is around 1/28 for ball and 1/72 for conical.
I might have those reversed.
Good luck- the two kits - Hawkin and Cabelas- were a lot of fun building 30 some years ago, and dusting off time to time since. Maybe one day I'll hunt with one, tho my Denver brother killed a doe at 15 yards with the Hawkin. He's since bought an in-line. I probably should get that rifle back from him one of these years...
Your twists are screwed up LOL.
1:28 - 1:48 for sabots/concials
1:48 - 1:72 for patched round balls.
A 1:48 twist will do excellent with round ball. The original Hawken rifle used a 1:48 twist, rifling depth plays an important part. TC's only use somewhere around .004" rifling dept which is very shallow and will let the patch strip out.
