Gartenguy: an unbelievably talented and generous friend that is part of this Forum made me a Manson-style gauge. Works great and quite consistent. My only improvement was to affix a tape measure and make the pin slightly more 'pointy' in order to get in the bottom of pits.
It is very helpful to have an assistant help rotate the barrels which I affix to a weighted box (in which I carry the gauge and bore gauge) using bungie cords, and record numbers.







http://www.brownells.com/gunsmith-tools-...-prod20463.aspx

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