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In order to make sense of case head expansion, you need:

1. A micrometer with 1/10,000 inch accuracy (I think the Lyman is only 1/1,000)

2. New, unfired cases

Measure each individual case and either mark the axis you measure it on or note the headstamp orientation.

Measuring a bunch of once/twice-fired cases on random axis with a 1/1K micrometer is just a waste of time.
 
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