The Whidden Gunworks shoulder bump gauge enables you to adjust your sizing die to the desired measurement. The bump gauge is attached to your calipers with a set screw and determines the measurement from the base to the shoulder of the case. Compatible Calibers: 22 BR, 22-250, .224 Valkyrie, 6 Dasher, 6 BR, 6 PPC, 6 BRDX,6 BRX, 6XC, 6 ARC, 30 BR, .300 BLK
