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Sinclair Bump Gage Inserts can be utilized to measure the quantum of shoulder bump that is necessary when configuring full length sizing dies. The Bump Gages can be inserted in either our comparator bodies and are crafted to suit the specific shoulder angles of cartridges. Instead of measuring to the datum line, these gages provide an indication off the shoulder of the case to enable a better and more accessible measurement of the sizing volume for the cases. As a recommendation, we suggest a bump between .001" to .002" for bolt action rifles and between .003" and .005" for AR-15 type rifles. Furthermore, the Sinclair Bump Gage Inserts offer an advantageous tool in terms of keeping your brass and loaded ammunition differentiated, especially if you possess multiple rifles chambered for the same cartridge. The gadget also serves the purpose of verifying loaded ammunition.