The Neck/Shoulder Sizing Bushings are designed specifically for Short Action Customs Modular Sizing Dies to precisely size the neck of the cartridge and adjust bump.
These bushings feature a new internal geometry aimed at reducing neck runout and improving loaded cartridge concentricity in the chamber.
Constructed from 17-4 H900 stainless steel, these bushings undergo the same heat treatment as Precision Resizing Dies, ensuring a smooth and slick finish.