BBob
WKR
People conflating case head measurements and measurements at the .200” line, two different things with two different purposes. You need a blade mic for measuring the case head (just above extractor groove) but not the .200” line (but you could use one here if you wanted to). Measuring the case head is a hit or miss proposition to attempt to judge pressure/over-pressure. Measuring at the .200” line is used as an attempt to decipher brass, chamber, size die fit.That measurement can only be accurately take with a ball mic, at exactly .2" above the case head, so it's a little harder to diagnose based on dimensions and specs.
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