RCBS self-centering, replaceable neck bushings are engineered for use with gold medal match series dies, enabling precision bullet tension control. This feature reduces neck brass work hardening, enhancing both case durability and shooting accuracy. However, these benefits rely on using top-tier brass with uniform neck thickness. To determine the best bushing size, reloaders can either measure the loaded cartridge's neck diameter and subtract 0.002 - 0.003 inches or calculate by doubling neck wall thickness, adding bullet diameter, then subtracting 0.001 inches . Keeping bushings one or two sizes above and below your calculated target is also advised.

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