I have found when full length sizing size a case, try it, and If further adjustment is needed select another case, make the adjustment, try this case.
What I found is that if using the same case and making small adjustments till satisfactory bolt closure the next case sized ends up oversized.
I think this is caused by hysteresis/springback with small adjustments.
However, I now anneal every firing so the above may hold hold true anymore.
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