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So when you run a bunch of powder through the measure it "lubes" it? weird!
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Smokeless powder is coated in powdered graphite to help it flow better, so that must be what lubes the powder measure. I haven't tried cleaning any granules to find out, but my understanding is that it's the graphite that gives smokeless powder its typical dark gray color - without it, it would be a sort of translucent yellowish-white.