A tip I forgot to mention. As I like to Hunt with a Fouled Bore I ALWAYS cover the end of the Muzzle with Masking Tape to prevent moisture from getting in. I cut a piece just a little smaller than a Half Dollar to use, befor I apply it I will clean the muzzle end with alcohol to remove any oil so it makes a good seal. It stays on perfect, even after the shot there is still the tape around the outside of the muzzle end. It's not affected by snow or rain. Or get some small ballons or finger cots to use, I always cover the end of the Muzzle.
(BP)