With RCBS gold medal match series dies, these precision-engineered, self-centering neck bushings let you customize neck tension, significantly improving accuracy and case life by reducing the mechanical strain on the neck during reloading. To see full results, you must use high-end brass that features consistent neck thickness. The right size can be determined either by subtracting 0.002 - 0.003 inches from the outside neck diameter of a loaded round or by doubling the neck wall thickness, adding the bullet's diameter and subtracting 0.001 inches. Keep bushings one to two increments above and below your target for versatility.

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