A consideration for putting a scope on any percussion muzzle loader is fouling the lenses of the scope. The obejective lens is subject to considerable fouling from the black powder smoke, and the ocular lens will very likely get coated with residue from the percussion caps, and eventually pit from this. The constant cleaning will reduce or remove the coatings on both of these lenses. In my opinion, I wouldn't bother with it, and yes I know what they say about opinions. Just because you can do something, doesn't necessarily mean you should.
those who beat their guns into plowshares, will plow for those who didn't