This instrument provides an extremely quick method for comparing bullets, seating depths, fired cases, sized cases, trim lengths and loaded ammunition for uniformity. Easily perform any of the following tasks: * Sort bullets for uniformity * Sort cases fired in two or more rifles * Sort sized cases for uniformity * Compare sized cases to fired cases to determine the amount of headspace * Check uniformity of shoulder bump * Check bullet seating depth uniformity * Sort loaded ammunition for uniformity * Determine when cases need trimming * Check trim length uniformity Supplied with one bore diameter bushing, surface contactor, shoulder contactor, headspace gauge and complete instruction.