It sure would have been nice of one of them fur trappers that kept a journal if he would have told us how they handled this problem. I've left my rifle loaded over several days during hunting season and not had a problem. A friend did the same and when he test fired it went sssssssssssst foop plop sizzel sizzel. You could hear the powder cooking in there for several seconds after the ball hit the ground. I've killed a buck in a driving rain storm just to prove I could do it, and I've had my priming turn to soup on a foggy day. As a general rule I shoot out my load after hunting and start fresh in the morning. I don't want a hang fire or misfire so why give it a chance. It happens anyhow -- as an example, Gary and I were hunting. He had a smooth bore, me a .62 cal rifle. We had been hunting most of the morning when a little buck walked out in front of us and stopped well within range of the trade musket. Gary aimed an klatched. He re primed and klatched. I'm loosing my patience while he reprimes and klatches again. The buck is standing there wondering what those two idiots are doing. I wonder what is taking Gary so long -- good grief, he is changing the flint. Well to heck with that, I'll pop 'em off. I aims and klatch. Reprime, aim and klatch. Gary is still changing the flint. I reprime and get a flashssssssssssst---------boom. The ball must have passed the buck 10 feet over his back. He'd had enough, Gary was still changing the flint, I'm reloading and the buck walked off into the reprod (Christmas trees to you city folks) and was gone forever. Two old guys, total of at least 60 years of muzzleloading experience, buck walks off. Why push your luck and leave it loaded. Our guns were loaded probably 3.5 to 4 hours that day, we both had new flints and fresh priming, in fact fresh priming two or three times. What went wrong. Probably condensed some moisture, because it was really cold and damp and we had the heater on in the truck when we drove from one unit to the next, then we got out to hunt. Who knows, that's the best I can come up with.