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Black powder is measured by volume, rather than weight
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If it's real black powder, you can measure it by weight or volume, it's the black powder substitutes that you must measure by volume with a powder measure calibrated for black powder.
The reason is that they are less dense than black powder but are designed to replace black powder by a volume basis not a weight basis.
One black powder substitute, Blackhorn 209, gives charges by volume for muzzle loading firearms but lists charges by weight for cartridges. That's because a muzzle loading shooter is more likely to have a volumetric measure calibrated for black powder with him and a reloader is more likely to own a scale.