Reloaders can fine-tune neck tension and improve shooting performance with these self-centering, interchangeable bushings, designed specifically for RCBS gold medal match series dies. By minimizing neck brass work hardening, these bushings contribute to longer case life and improved accuracy. Consistency in brass neck thickness is critical to realizing these gains. To determine the correct size, measure a loaded round's neck diameter and subtract 0.002 - 0.003 inches or multiply the neck wall thickness by two, add bullet diameter, then subtract 0.001 inches. For best results, RCBS suggests keeping a selection of bushings around your target size.

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