Designed for use with RCBS gold medal match series reloading dies, these interchangeable neck bushings center themselves perfectly and enable precise control over neck tension during bullet seating. This not only reduces stress on the case neck-minimizing brass work hardening-but also improves case life and accuracy. To maximize these benefits, it's important to use premium brass with consistent neck wall thickness. Proper bushing size is determined by subtracting 0.002 - 0.003 inches from the outside neck diameter of a loaded cartridge or by calculating twice the case's neck wall thickness, adding the bullet diameter, then subtracting 0.001 inches. For maximum versatility, RCBS advises keeping bushings within one or two increments of your desired size.

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