Pyrodex can work just fine in a non humid or low humid environment...but im in south texas where humidity is at about 80s-90s% ...thats the killer. It immediately creates a sticky foulind and starts to eat the metal. You can sometimes see rust while doing a shooting session. Now i have used it in a low humidity environment of about 10-15% relative humidity and although i still didnt like the fouling ...its reaction in my barrel was different., not as bad. But as soon as im shooting locally in the high humidity i have issues. My cousin from el paso loves pyrodex and would always give me grief sayin i was "doin somethin wrong" because hes never had an issue and swears by pyrodex. One year he comes down and brings his "inline" (yeah, hes one of THOSE guys...hes family so i cant shun him too badly) and while enjoying a shooting session he starts realizing his fouling is keeping him from ramming a sabot down..hes surprised as its never happened before with his current bullet and sabot combo..even used a large felt wad and card. He took a look into his barrel and noticed the thick fouling...then we went home...but before we did we stopped to grab some drive through burgers...we sat together and took apart guns...we cleaned our stuff the usual way and he bragged about how inlines are so easy to clean and even tho he experienced the humidity affect the fouling he said he still swears by pyrodex. Next afternoon we have family stop by and wants to check out his inline....he proudly pulls it out of its bag and is shocked to see orange rust at the crown. He quickly takes it apart and realizes he has rust in some parts of the barrel and breach plug. He cant figure out why. Asks too see my guns because it must have been tthe soap or bucket of water we used. I just smurk and say "....pyrodex". He must have scrubbed that gun for a good hour with a wire brush. He never used a brush in the past...a swab was always good enough in high and dry El Paso..but in low wet south texas he learned his lesson. So...moral of the story is pyrodex is evil.