Got one more snake to kill. A person wrote recently on this forum (I remember who but not where, so I can't quote him exactly) that Pyrodex was affected more by moisture than black powder, making it less trustworthy to hunt with. I quote Layne Simpson from Rifle Magazine, July-August 1980, "Hunting Loads for the.50 Muzzleloader": "Pyrodex can do anything black powder can do....and if its residue is not properly removed during cleaning, it rusts a rifle a tad slower but eventuallly to the same degree of ruination. From a hunters viewpoint, Pyrodex is less affected by damp weather. Less important, it leaves a minimum of fouling residue...The problem with black powder lies in the fact that its residue is much more hygroscopic than the residue left by Pyrodex, and with a little humidity, it quickly becomes a mass of gunk that can cause a misfire by clogging up the nipple orifice and drum after just one shot.
"A good example of this problem with black powder happened to me during a Tennessee hoghunt. We were hunting on a hot and humid day....(he shot and)...reloaded with FFG and didn't fire my rifle again until back in camp....I decided to fire the rifle to clean it for the next hunting session. After expending a dozen caps and almost wearing out a nipple pick, I removed the nipple, picked out the thick gumbo residue, dribbled a few grains of uncontaminatred powder into the drum and tried again. The rifle did produce smoke and noise and sent the projectile flying, but after all that effort, it still hangfired. I could go on and on about the trials and tribulations of hunting with black powder, but I've made my point. I have especially had ignition problems with black powder when hunting on rainy days even after my load-waterproofing efforts..."
The only time I hunted in the rain was on my last elk hunt with a .58 fullstock flint Hawken I built and Goex 2F, and while I had the pan goo problem, the rifle fired when I emptied it to clean, on two days. See the Hunting Journal forum here, "Flintlock Elk Hunts" by Herb, 10/12/09.