[Ron Wood]

I really don't know too much about black powder, but I believe it comes in different grades and burning rates. The designations are something like ffg, fffg and ffffg as near as I can recall. I think that ffffg is very fine, fast burning and potentially dangerously explosive in quite small amounts. I think it was used as the priming charge for flintlock weapons. That more than exhausts my knowledge of the subject. Somebody jump in here that can straighten me out.