Easy-to-use, precise overall length (OAL) gauge provides essential load dimensions quickly and reliably. Accurately determines overall cartridge length for proper bullet free run and bullet-seating depth dimensions; firearm throat dimensions; and extent of throat erosion. Simply thread on any Chamber-All Modified Case. Made in USA.

For use with all autoloader, lever-action, or pump action rifles. Also fits bolt action and single shot firearms. Inserts into chamber through the ejection port.