The Neck/Shoulder Sizing Bushings by Short Action Customs are designed for their Modular Sizing Dies, specifically for the .300 PRC cartridge, with a diameter of .334 inches.
These bushings aim to reduce neck runout and enhance loaded cartridge concentricity due to their new internal geometry.
Constructed from 17-4 H900 stainless steel, the bushings undergo a similar heat treatment as Precision Resizing Dies for a smooth and slick finish.