Hey...I thought the rolled up piece of paper towel in the pan, with the cock resting on it, was my idea! On a loaded cap gun, I also put some paper towel between the hammer and cap.
I always leave my rifles loaded for the season. Never a miss-fire, and when I do shoot them off after season, sometimes way after season, they kill the paper plate every time. I have never had an issue with rifles rusting or miss firing from being brought into the house from the cold. I think the ride home in the truck or jeep, in a case lets them warm up more slowly, my man-cave is the coolest (temperature wise, and otherwise
room in the house, so maybe that helps. Maybe some people's houses are much more humid than others. And, the first thing I do when I get home, or back to camp, is to wipe the rifle down, with a special rag that's kind of dirty and oily.
Popping a cap before loading used to be the WORST thing one could do, even though everyone did it. And miss-fires were common. I hear that the new caps are different, but when the ML craze first got going, the residue from the fired cap would attract moisture, and this kind of "fuzz" would grow and block the nipple and flash channel. Cleaning and drying the nipple, and flash channel within an inch of its' life, and not popping a cap is the way to ensure 100% reliability with a cap gun.
I always use real BP, hate the fake powders. Real black powder will NOT attract moisture. But if you hose down your flintlock lock with WD-40, or any kind of penetrating oil, or even use a generous amount of oil, after cleaning, it will migrate and soak into the priming charge, possibly the main charge, and make one believe that the powder "absorbed moisture from the air". Nope, it was the oil silly. Lube it with grease, sparingly.