Very good point and I didn't think of that fact as a reason for using a dummy round to adjust your dies to determine the seat depth as opposed to COL. My old buddies who shoot off the bench with their really big guns would be upset with me for forgetting that fact...
FWIW, I have a couple friends that I used to work with at a gun shop that shoot 1000-yrd Bench Rest guns. With those guns the secret is doing everything exactly the same every time. It's the first time I saw anybody weigh their match bullets and sort them before reloading...
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