I'm going to repeat this for those who have survived since the initial post. There are legions of monks who met their maker trying to figure out the black powder manufacturing process.
Part of the process is drying, grinding the mixture. Black powder derivatives have a bad habit of igniting under pressure -- like grinding/mixing.
I'd be curious too if there aren't laws that regulate the production of "explosives." Black powder is considered by the BATF as an "explosive" as contrasted to a "propellant" -- which is how it classes smokeless powders.
BATF rules for storage/sale of black powder are different than for smokeless, or even for Pyrodex.
