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If you're setting up full length sizing dies, you can use Sinclair Bump Gage Inserts to measure the amount of shoulder bump. These gages are designed to fit certain shoulder angles of cartridges and are installed in either of our comparator bodies. Instead of measuring to the datum line, the gages indicate off of the shoulder of the case to provide a better and more easily assessable measurement of your case sizing. We typically recommend between .001" and .002" bump for bolt action rifles and between .003" and .005" for AR-15 type rifles. Additionally, the bump gages can help keep your brass and loaded ammunition separated if you have multiple rifles chambered for the same cartridge and can be useful in checking loaded ammunition.