This is nothing to sneeze at with a muzzleloader!My group is 2" @ 100 yards.
My T/C Renegade is capable of this as well - and ragged one hole at 50 yards - AND with open irons - and with a heavily pitted and lapped barrel!
Unless your scope is binding in the rings and takes a firm 'push' to seat it in and the top rings are snug as well you probably won't benefit much.
If the scope sits down smoothly in the rings with little to no binding and can be moved fore and aft smoothly it's probably fine.