Wellll, I bought a small amount of potassium nitrate 1# and sulfur 1#. From skylighter.com then I made my own red fir charcoal.
I tried to do it with stump remover and garden sulfur. Don't waste your money.
Skylighter has a black powder kit but I wasn't ready to spend 80$+ yet so .
Used a ball mill from harbor frieght 6# version.
Lead 54 cal balls as media and then weighed out the 3 ingredients per skylighter instructions online.
Thru all that in the ball mill and 6 hrs later viola , black magic.
Still need to alcohol it and grate it over a strainer but the mill dust seems impressive.
There are lotsa videos on line.
Really easy I thought .
Kevin