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Using a powder measure for throwing charges is charging by weight, not volume. Volumetric powder measuring is estimating (usually more of a guestimate) a correct charge based on density information provided by the powder manufacturer for approximating a charge weight by volume.
I can't imagine that anybody'd use a powder measure that hadn't been adjusted by charge weight. That's not volumetric charging. How would you possibly compute volumetrically using a powder measure in which you have no idea what the volume of the cavity is at any setting?
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