With Bullseye +/- .1 gr works well. Time spent trying to get more precise than that is better spent on sorting cases and bullets.

One observation I've made - as a reloading session goes on, the powder tends to settle in the hopper and the weight of thrown charges tends to creep up a bit. It may be throwing .2 or so heavier than it was at the start. I'm wondering if a baffle in the hopper would help.

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Common sense isn't so common.