RCBS Neck Sizing Die Bushing 315 Diameter Steel

For use with RCBS Gold Medal Match series dies. Works in both the full length and neck sizing styles. To find the proper neck bushing size, measure the outside neck diameter of a loaded cartridge and subtract .002" to .003" to allow for brass spring back. RCBS suggests having have neck bushings one or two sizes above and below your target diameter to ensure the perfect fit.Neck Bushing Size (RCBS instructions):Proper neck bushing size can be determined two ways. Measure the outside neck diameter