I found times gone tech awhile back, he doesn't have a big following but I subscribed.
I found him when I started researching make BP .
Like how he described and tested serpentine, screened and press powders.
I tried the big C clamp pressing method use shows but ended up with the 20 ton harbor freight press.
With the price of Swiss here, about 56$ per LB and goex unavailable it just makes sense to make your own.
And for those of you worried about pressing and grinding and grading etc
Screened powder is the easier way to go and works pretty darn well too, just use alittle more that you would compared to pressed powder
IIRC that's the way it was made until the mid to later 18th century.
Don't need any special equipment either, just a way to mill it , a harbor freight rock tumbler will work for that in small batches and a kitchen screen type strainer will work .
Go make some powder dang it!!
Kevin