Black powder is fun but somewhat weather dependent. Rain is tough but summertime can be a bit dangerous due to fire hazard. I have my own range and resist shooting BP when the grass is dry. Burning power and patches can start a fire real quick so be aware. Indoor BP is fun but sometimes theres unburned powder ( usually from .22s) left on the concrete floors and contraction joints which will light up at the nost inopertune moment and scare the h--l out of you. The bystanders love it when shooters have to do the cockroach dance to put out the flames.
Really? I don't think shooters of any kind have burned the world down?? I live in high dry country. I have never known of a BP shooter setting fire to or dancing in the Sagr brush. If what you said is true the trappers who marked the west before 1840 would have only left a black land scape. You should warn folks who go out and cook hot dogs, they start most of the range fires.
I didn't belive it either until is happened to me twice. I even went to plastic wads and had similar but less drastic results. Our "wooly booger" weeds (the kind that stick burrs on your clothes seem the worse. The indoor range thing is still a legend here and the sight of old bearded guys and young men alike doing the stomp without music is had to erase from memory.
Small arms fire during the Civil War started a few fires but that was thousands of rounds in very dry conditions. I can't ever remember having a patch smoke when it hit the ground let alone smolder. If you have smoldering patches you're doing something wrong.