A while back, when I was testing a bunch of scopes, a corporate Leupold representative told me, "Nobody puts scopes on muzzleloaders." With some twenty scoped muzzleloaders on hand at the time, I found that answer amusing.
It unfortunate that many folks behind the counter advise their customers that muzzleloading rifles need "heavy reticle shotgun / muzzleloader scopes." There are few inline muzzleloaders today that cannot approximate .30-30 ballistics-- and few counter salespeople would suggest that that is not a "real" rifle calling for a "rifle" scope.