Friend sent me a link to this guy once before on making black powder,

and it was a very good piece.  Other day sent me this one, in which they lowered the density of the powder to see how that worked.

It worked nicely.

I'm kind of glad I never started making my own, because this would be another chunk of time that would be used to try this out.  And since I'm currently keeping the kleenex industry busy, I especially don't have time.

Neat stuff, people.