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The Sinclair Bump Gage Inserts are utilized for measuring the extent of shoulder bump while setting up full length sizing dies. These gages complement either of our comparator bodies and are customized to accommodate specific shoulder angles for cartridges. Instead of measuring to the datum line, the gages indicate off of the shoulder of the case to deliver a more readily accessible measurement of how much the cases are being sized. For bolt action rifles, we generally advocate for a .001'' to .002'' bump, while for AR-15 type rifles, we recommend between .003'' and .005'' bump. Additionally, the gages are practical for keeping your brass and loaded ammunition separate in case you have multiple rifles chambered for the same cartridge. They can also be used for reviewing loaded ammunition.