Exactly.
It's the volume issue I'm trying to solve.
I'm going to "beef up" my reloading table so it doesn't vibrate/move so much when I size the cases.
It's this vibration, I believe, that's causing the inconsistency when I meter Varget. Since it's an extruded powder, it doesn't pack tightly in the powder drop measure- and excessive vibration (I think) causes overcharges of up to half a grain sometimes. The ball powders meter very accurately, so I'm guessing this is the issue.
Hopefully beefing up the table will help, if not this seemed like an interesting idea if practical.
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