Any available in the Dallas, Tex area?
My last two sources were a) the NMLRA shoot in Friendship IN (only members can buy) and b) I'm making my own.
Homebrew Black PowderThe method I use, called Ricing, simply puts the damp mix through a screen, and then crushed and dried. If you go the homebrew route, you will instead need to take the damp mix and run it through a hydraulic press and make compressed pucks. This associates the Nitre with the charcoal much better, and you end up with a denser powder.
Ricing was the only way they made BP up until about 1800. I'm mostly using mine in a Brown Bess Musket, so what I'm doing is fine for this purpose. After 1800, the additional step of pucking made the denser powder that BP cartridges are based from.
Surprisingly, my first batch of homebrew turned out remarkably well. I had expected 120 grains to do the work of 80 grains of Goex. The end result was closer to 1:1, and it burned remarkably clean.
You need a good charcoal source. I used Ailanthus. It grows like a weed in my hard. Willow is great. However, the latest fad is toilet paper. You can reduce a roll of toilet paper and get the absolute finest BP out there.
Here's the Bible:
https://castboolits.gunloads.com/showthread.php?103852-My-homemade-black-powder