I would recommend you do just that and start here ...
http://en.wikipedia.org/wiki/Explosive_material
You should be worrying about how to make reloads that shoot infinitely small groups instead of a subject that I have never seen discussed in all my readings about original gunpowder, plus others really don't care about, including myself
Your question is in the league of a fella who once asked:
I need a loading data that is 3.5grs and my powder charger only throws a 4 gr charge. How do I cut the grains in half to get 3.5 grains?