Got sulfur, wood and chicken manure? You to can make your own black powder with a little trial and error. And the right books on the subject of course.
Discussion
Yeah, amoungst other methods.
Old corrosive primers are well within basic Chem.
Speaking of chemistry if one were particularly uncaring about innocent life there’s options. Horrific and I’m not endorsing in anyway. There’s thousands of people out there that could do it though. Biological to. And both are only going to get easier and the number of people capable higher.