Was the purpose of the muzzle loader as a hobby or more serious shooting ? Non the less, at one time it was what they had right ? Single shot, good to about 50 yards with a plain bore barrel or 75-100 with a rifled barrel. Reload time if you get efficient at it maybe a minute but two wouldn't be unexpected for one shot at a time with a smoke filled scene.. Bullet velocity low but it is heavy,then again it's ball ammo. On the flip side of this much ammo is out of stock these days, if you have reload stock now in BP keep it, at least you have something .
I'm thinking used, good mechanically, maybe some external wear Winchester lever 30/30 or/ but better yet/ and a shotgun. Plenty can be said for both of these these but if nothing else they will shoot on damp or even a rainy day. Just a thought and investigation. I mean they were the natural progression up from muzzle loaders back in the day.