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:

6.5-284, 26 Nosler, 28 Nosler, 7mm Rem Mag, .284 Win, 7/284 Shehane, .300 Win Mag, .338 Edge