Black powder is classified as an explosive. So storage requirements are a lot more regulated. The subs are classified as an accelerant just like any other smokeless powder. The storage requirements are vastly different.
I get all of my real black from Crater Fireworks. He is nearby and I don't have to pay hazmat.
Pyrodex is the most corrosive out of all the powders. All I use now even in the inlines is real black. The cleanup is way faster than anything I have used
I think you mean “propellant”.
Those requirements are just too expensive to meet for small shops, and the demand for the real stuff too small.
