The first thing to do is to make sure that the mounting accessories are a perfect and right fit for your muzzleloader.
Then, mount the bases. Make sure it doesn’t touch the surface of the barrel. Permit clearance at the eyepiece so that the bolt operation is not hindered. Using a proper toolset is essential for the fitting of a muzzleloader.
Set the right distance between the scope and the barrel and tighten the screws. To protect the scope, you can use a thread-freezing compound like Loctite. Ensure that the screws are appropriately holding the barrel and the scope.