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Old December 11, 2019, 05:13 PM   #11
Bart B.
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Join Date: February 15, 2009
Posts: 7,410
Military 30 caliber throat erosion gauge heads have a taper of .010" per inch starting at .2990" diameter up to .3090". They go 1/10th inch further into the chamber throat every ~1000 rounds in 7.62 NATO barrels, every ~900 rounds in 30-06 barrels.

Last edited by Bart B.; December 11, 2019 at 05:30 PM.
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