I lost a link when my last pc died, and I still can't find it (updated)

It was a very interesting piece on modifications made very late in the black powder age specifically to make it a more efficient propellant for artillery.  Had a lot of information on using different materials to make the charcoal, and specifically making the granules in certain shapes for better burning.

I'm still occasionally trying to find it with no luck.  If I ever do I'll damn well post it right away.

Update: found this small bit on the subject.  Still looking for the original.