With RCBS self-centering, interchangeable neck bushings for gold medal match series dies, reloaders gain superior control over bullet tension to reduce case neck stress and extend brass use, while also improving shot precision. This accuracy enhancing feature requires brass with consistent neck thickness. Choose the right bushing by subtracting 0.002 - 0.003 inches from the loaded round's neck diameter or by doubling the neck wall thickness, adding bullet diameter and subtracting 0.001 inches. RCBS also advises keeping one to two sizes above and below your target diameter for optimal adjustment flexibility.

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