Don't know if this helps, some, most of you probably do this, but when I load with loose powder instead of paper cartridges, I cap the empty chambers and fire them. This burns out any contaminates left over from cleaning and such. (Just another trick I learned for the 'old timers' that were still around when I was growing up.) The only time had a failure to fire was with 'bad' caps. Like anything mechanical, even modern cartridge pistols have problems. Wish I had a dollar for every modern automatic pistol I've used stove piped. (Google that one.) The beauty of a revolver, even BP revolvers is that you can easily and quickly cycle to the next round.