MP;
I don't currently have equivelent powders of different granulations to do a meaningful test. I think though a study of your chart will show it is not in order by Granule size. I don't recall now exactly where the Cartridge fits in but FG, 2FG & 3FG would be in line if granule size was the only difference, but they are not. This is true of any mat'l of this nature, powder shot etc. Given the base mat'l is the identical the smaller the granules, for a given volume the less air space will be present, so the smaller will weigh heavier. A dipper full of #9 shot will weigh slightly more than the same dipper full of #8 etc. Of course if you had a real high antimony #9 vs a pure lead #8 the situation could easily reverse. I have no doubt you accurately measured & weighed, just think there had to be a difference in the powder itself other than the granulation size.
