MT: Folks back then didn't have our fancy electronic scales. But they could use a balance scale, where you put one ball in one pan, in the place of a weight, to be your standard, and the other pan was where you put the balls you wanted to weigh. How close them came to that balance point determined if they were kept or melted back down. I don't believe scales were used to meaure much in the way of black powder. First, they did not have the fine, machine made, wire mesh screens to sort the powder. Second, most BP was much coarser, at least until the early 19th century. And finally, Until industry could do a better job of controlling the relative amount of the three incredients used to make BP, weighing the powder did not give you much of a standard. So, Volume measures were used. Pressure were low enough not to be a danger of blowing up the over-engineered muskets and early rifles. In muskets and military guns, the same powder that went down the barrel was what was used to prime the pan. That is what they had, and that is what they made do.