Re-read the response from 54ball. He reveals some wisdom about rifle "Style" vs./ caliber.
If you're sure you want a 54 caliber...look at some of the Pennsylvania schools. Isaac Haines for example.
On the other hand, if you want this new rifle to be a Southern style, I'm also going to recommend that you look at smaller calibers.
Just personal opinions and worth what you paid for'em.
A fellow showed up at my club last month with a brand new, unfired TVM "Southern style" rifle, in 54 caliber. He had just got it from TVM. He's not an experienced shooter of traditional muzzleloaders. I tried to engage him in a conversation about patch/ball/powder choices but he didn't need any of that. He was pre-convinced he would be shooting 100 gns of powder, and he did...but not for long. :surrender:
Haven't seen him back. :idunno:
Good Luck, whatever you choose.