These micrometer cartridge headspace tools will enable you to set up full length sizing dies for the precise amount of shoulder bump you wish. Precision Mic gages are initially calibrated on a once-fired case, and the micrometer will read shoulder set back variation from initial set-up. Each Precision Mic kit also includes a bullet seating depth tool for initial seater die set-up.

A few twists of the Precision Mic and you'll know your chamber headspace and bullet seating depth to 0.001". The Precision Mic measures from a datum point on the case shoulder to the base, giving you the exact SAAMI tolerance readings. An indispensable tool for safe, accurate loads that extend the life of your brass and firearm

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