JC you are spot on just use real Black Gunpowder. and the problem is solved.Old-fashioned guy. For muzzle-loaders I like genuine black gunpowder, about 75% potassium nitrate, with sulfur nd charcoal, all ground together. Would not put anything else down the bbl. Some years ago I had to buy 25#, a lifetime supply, to get real gunpowder..
The problem with Pyrodex pellets is ...they are made out of Pyrodex which is rust that burns,
IMHO
Bunk