Use a patch when loading round balls in a musket. Lube the patch if you want to clean less often between shots You can lube with almost anything from spit, dawn/water solution, ballistol, various mixtures of beeswax and vegetable oils, etc. If using black powder when shooting muskets start with the number of grains = caliber and work up from there. You can use lubed wads when shooting revolvers to help with sealing the powder charge, keeping the fouling in the barrel soft, and taking up space when using light charges