RCBS Precision Mic Cal. 270 Winchester #88316

A few turns of the Precision Mic and you can determine the headspace of your firearm’s cartridge chamber and the bullet seating depth to within 0.001”. The Precision Mic measures from a specific point on the shoulder of the case to the base, giving you an accurate reading of the tolerances specified by the SAAMI system. An essential tool for safety, for accurate loads that extend the life of your cases.