RCBS interchangeable neck bushings are an essential companion to the gold medal match series reloading dies, enabling precision adjustment of neck tension for improved accuracy and prolonged case use by minimizing neck brass fatigue. These results depend on using premium-grade brass with even neck thickness. You can determine the right bushing size by measuring the loaded cartridge's outside neck diameter and subtracting 0.002 - 0.003 inches or by using the formula: (2 x neck wall thickness) + bullet diameter - 0.001 inches. RCBS suggests owning bushings within a two-size window of your target for maximum performance.

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