I have been unable to locate any FFFFg powder to prime my flintlock from any source reasonably close (40-50 miles). I really don't want to pay HazMat fees for shipping. One source (which sells FFg and FFFg, but not FFFFg due to little demand) suggested using mortar and pestle (which I have) to grind a larger size down. I have tried that, and get what appears to be a mixture of mostly very fine powder and some remaining coarser grains. The final product ignites my gun, but I seem to get a greater amount of the larger grains being dispensed from my primer than the finer powder. This also seems to produce a slightly longer lock time which is not good for accuracy. Do I just need to spend more time grinding to get a more uniform powder? Can I expect the finer powder to reduce the lock time?