Got back into muzzleloaders in 1999: There have been three hunting misfires/hangfires; two on wild hogs, the other on a 170 class buck. Last misfire was in 2003. The two misfires on hogs were due to a weak striker spring in my CVA Mag Hunter. Was hunting in the rain with my CVA StagHorn when that buck stepped out: The gun used #11 caps at the time.
When it's raining my guns get a finger cot on the muzzle. The guns stay loaded until they're fired at game.