RCBS Precision Mic Cal. 7x57 Mauser #88323

A few turns of the Precision Mic and you can know the headspace of the cartridge chamber of your firearm and the bullet seating depth up to 0.001”. The Precision Mic measures from a specific point on the shoulder of the case to the base, giving you the precise reading of the tolerances required by the SAAMI system. An indispensable tool for safety, for accurate loads that prolong the life of your cases.