RCBS gold medal match series dies are compatible with these self-centering, interchangeable neck bushings that give reloaders exact control over neck tension, which plays a critical role in reducing case neck work hardening and boosting both case longevity and shooting accuracy. To see these benefits, high-quality brass with consistent neck wall thickness must be used. To select the correct bushing size, measure the loaded round's outside neck diameter and subtract between 0.002 inches and 0.003 inches to allow 0.001 inches of spring-back or measure the neck wall thickness, double it, add the bullet diameter and subtract 0.001 inches. RCBS recommends keeping bushings one to two sizes up and down from your target for best results.

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