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Basically, it is what it is....
It seems to be related to how those types of case trimmers hold the case.
I use the Wilson which avoids that. FL sizing makes the case pretty perpendicular to the base. Then the trimmer aligns the case centerline perpendicular to the cutter. Any misalignment found measuring CL is base to body and is meaningless.
Base to body perpendicularity really cannot be corrected as it is caused by the gun.
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