I just bought a cap'n'ball revolver. It is a Pietta- Griswold & Gunnison .36 cal. Modeled after the Colt '51 navy. I have never shot black powder and was wondering what/where to get powder. I ordered some Alliant MZ, without doing much reserch on the matter. Recently I was looking up to see if there was a certain grain weight that I should use due to it being a substitute, and it looks like this was a bad choice on powder to purchase. I understand that I need to be looking for some FFFG, like goex or some sort. But I am having a hard time finding it by the pound and to order over the internet. Currently I am in Afghanistan, so just going to the local gun store is out of the question and want to shoot this pistol when I get home for leave. Is there any suggestions or answers to my riddle?