I stumbled on this thread, I typically frequent the "smokeless" side, but a customer of mine, who is a bit of a survivalist, gave me a book the other day, that gives extremely detailed and precise instructions for several types of blackpoweder, from blasting powder, to fireworks, to gunpowder, along with the recipes of several of the old commercial blends.
It is called
Blackpowder And How to Make It,
An illustrated guide to the amatuer production of Blackpowder
by Randy and Leigh Ellis
Library of Congress # TX 2-430-837
I doubt that it is still in print, but it might be worth a look, as it seems to be a very thorough book, with an eye toward safety throughout.