I have left powder in a Dillon hopper and a RCBS powder drop for a long time ( several weeks), however I just purchased a RCBS electronic powder measure, the one with the attached scale.
I left bullseye powder in it over night and now the interior of the powder measure/hopper is pitted and rough. When I turn the powder dump knob on the right side of the machine the powder just stay in the machine hopper and I HAVE to us a long handle artist bush to remove the powder.
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Semper FI
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