50 cal Wolverine. I can keep them in the bottom of a coke can at 100 yards off a rest. Few weeks ago I was called on it by a guy that dont know me well while watching some friends shoot. I didnt have my rifle so I borrowed a friends Black Diamond. 3 shots later I handed him a target with 3 holes, all touching. I'll admit that it was a bit lucky that I did that good. Usualy they wouldnt all be touching. These muzzleloaders are capable of that kind of accuracy. They were 100 years ago, and 200 years ago. Its just about how good you are with open sights and shooting form.
With my rifle, 360 grain bullet, 110 grain 777 I'm a few high at 100 and 12" low at 200.
I've never shot at an elk over 150, and killed most of my elk inside 50 yards, and several inside 20 yards. I've seen the terminal performance of my load on several elk in the 140 to 150 range. I dont shoot elk any farther than 150 because I'm not confident in the terminal performance. I could hit them fine out to 200, I'm just not sure the bullet would have enough left in it to get the job done.
If I was still shooting round balls I would not shoot over 100, and try real hard to be less than 80 on elk. Round balls dont carry much down range in terms of terminal performance. They are plenty accurate, just poor terminal performance.
I dont muzzle stuff just to get close. I like getting close, but there are lots of other reasons why I muzzle stuff.