Sinclair International Bump Gauge Insert 22-250 Ackley Improved/6mm 40 Degree Stainless

Bump Gauge Insert Features Sinclair Bump Gage Inserts are used to measure the amount of shoulder bump when setting up full length sizing dies. The Bump Gages install in either of our comparator bodies and are machined to fit particular shoulder angles of cartridges. Rather than measuring to the datum line these gages indicate off of the shoulder of the case to get a better more easily assessable measurement of how much you are actually sizing your cases. We usually recommend between .001 to .002 bump for bolt action rifles and between .003 and .005 for AR-15 type rifles. Also a useful tool for keeping your brass and loaded ammunition separated if you have multiple rifles chambered for the same cartridge and checking loaded ammunition. Bump Gauge Insert Specifications Sinclair Bump Gauge Insert Stainless Steel 40Adeg Ackley Imp To 6mm