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Old November 17, 2012, 10:45 PM   #6
Senior Member
Join Date: October 7, 2011
Location: Southern NM
Posts: 141
HiBC is correct and the marking on the Precision Mic are relative and establish a baseline for setting up your dies. They are particularly useful for setting up dies on gas guns in which other headspace tools may not provide accurate measurements due to case distortion on extraction.
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