Word of caution, muzzle loading never went out in the Southern Highlands. Hacker and some of the other builders were making them right up to the revival of muzzle loading. What happened was percussion caps stopped being manufactured so these highland builders went back to flint. Some of the rifles they built were huge, made for resting on a log or chunk of wood. All sorts of calibers. Then there were "hog" rifles, most around 50 caliber built in the 1870's to early 1900's. A lot of them were percussion. So a lot of wiggle room.
The Southern highlands is a really fascinating area, totally self reliant. Everything they had they built/made/grew themselves. A certain amount of pride well deserved in that. Plus beautiful country- I really like visiting in that area.