Ok, stick with me on this one, it's slightly long winded, but I think it will work.
Alright I just picked up a scale to weigh my arrows and I was thinking that it might work for me to use it to measure my black powder charges. I know that when you measure them you are doing it by volume, so what I was thinking of doing is takinga chargethat I made by volume, measure it (weight), record the weight, and then from there on I could just make up my charges by weighing out the same weight of powder. Now if I were the change between 2F and 3F per say, than I would have to re-weigh that granulation of powder because it would settle more and inturn weigh more. BUT..If I just went off of one granulation and follow those steps I think I would be able to make very similar loads.
OK, so am I correct in my thinking because it seems to make sence in my head, but that doesn't always mean a lot. Any improvements on this are also welcome.