Get precise control over neck tension using these interchangeable neck bushings with RCBS gold medal match series dies, which not only improve shot accuracy but also reduce case neck work hardening for longer case life. These benefits require top-tier brass with consistent neck wall thickness. To find the correct bushing, measure a loaded round's outside neck diameter and subtract 0.002 - 0.003 inches or double the case neck wall thickness, add the bullet diameter and subtract 0.001 inches. To stay adaptable, RCBS recommends keeping bushings one or two sizes around your target.

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