The first time I went deer hunting with my .54 Cal Renegade I poped a couple of caps, they were water proof #11 caps loaded up. While I was in my stand it started pouring, I got soaked and cold. About 10:30 am I came out of the stand, couldn't stand the rain and cold any more, I decided that I would shoot out my .54 and go home dry out and put in a new load so I could hunt the afternoon. My gun didn't go off, no mater how many times I capped it. I got home and removed the nipple and could not see thru it, I got a fine piece of wire and pushed out 2 little circular cards. The cards were from the water proof #11 caps. Never again have I ever poped a cap, not before I load, Not to foul my muzzleloader. I have never had any taype of a problem. For first shot fliers I just clean my barrel between shots, I mean clean (solvent) and lube (gun oil) I do not just use a spit patch. Never had any problems.