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I use my sinclair bullet comparator that attaches to my calipers for checking how much I need to bump my case shoulder. That gives me something similar to the datum line reference on my fired cases. I also record this dimension in my notes and I can see if I have a developing problem. As has been said, adjust the dies so you only bump the shoulder .002 to .004. Cartridges chamber easy and case life is extended.
The case does need to be deprimed for this measurement. I did make my own attachment for the other caliper jaw that indexes on the primer hole to center the case, but the measurement is taken off the face. This makes the case a lot easier to hold in the calipers and it keeps it located in the same place.
I do use a straight edge to check for flat faces on the case. Not each one about every 10 or so until I find a bad one.
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If you have time to do it twice, then you have time to do it once right and put your name on it
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