A margin of error of at least 0.1grains is my experience, too... I dont worry about it.
1. I'm also using a "flake" powder (Unique) which doesn't seem to meter well through the Dillon powder charger.
2. I think my balance beam scale's margin of error is probably at least 0.1 grain — once "zeroed," I can adjust the scale at least 0.1 grain in either direction and it still is basically balanced.
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