These precision engineered, self-centering neck bushings are made for RCBS gold medal match series dies and allow reloaders to dial in exact neck tension, which reduces case neck work hardening, extends brass life and improves shooting accuracy-provided you're using premium brass with consistent neck wall thickness. To find the correct size, either measure the loaded cartridge's outside neck diameter and subtract 0.002 - 0.003 inches or double the neck wall thickness, add the bullet diameter and subtract 0.001 inches. RCBS recommends having bushings one or two sizes above and below your target for greater flexibility in tuning.

• Proudly made in the USA for superior quality and reliability