With RCBS gold medal match series dies, these self-centering, easily swappable neck bushings let reloaders adjust neck tension exactly to spec, reducing neck work hardening and improving both case life and accuracy-if the brass used has uniform neck thickness. The proper bushing can be chosen by subtracting 0.002 - 0.003 inches from the loaded round's outside neck diameter or calculating (2 x neck wall thickness) + bullet diameter - 0.001 inches. RCBS recommends reloaders keep bushings slightly above and below the ideal size for maximum control and consistency.

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