That is not correct Dave.
Bulk powders could be measured to the same volume (Dram/drachm = the proper capacity to measure one-sixteenth of an ounce by weight of black powder), but loading to weight in grains later became the standard.
Henry Sharp,
The Gun: Afield & Afloat, 1904
“Sportsmen are now in possession of two definite types of smokeless powder, the so-called bulk powder and the newer concentrated or condensed powder. The first is designed to occupy the same space as black powder in the cartridge-case, although only weighing about half as much.”
1902 Sears catalog "...dense nitro powder should be weighed using an apothecary's scale
and not measured."
