Not that it is a big issue, but the Sinclair bump gauge insert when used with the Hornady body or the regular Sinclair body cannot measure the shoulder bump on loaded rounds. The bullet tip will bottom out into the body. The Sinclair bump insert is shorter than the Hornady bump inserts. If it's important for you to check the shoulder bump on loaded rounds, Sinclair does make an extra large (longer) body that will allow you to measure loaded ammo.