RCBS interchangeable neck bushings for gold medal match series dies give reloaders the power to fine-tune neck tension with incredible precision, cutting down on case neck stress and improving both case longevity and shot-to-shot consistency. This performance depends on brass with consistent neck wall thickness. Determine the correct size by measuring the outside neck diameter of a loaded round and subtracting 0.002 - 0.003 inches or by doubling the neck wall thickness, adding the bullet diameter and subtracting 0.001 inches. Having bushings in a range above and below your goal is recommended.

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