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:

.25-06, 6x47 Lapua, 6mm GT, 6.5x47 Lapua, .280 Rem, .280 AI,.270 Win, .30-06