These interchangeable RCBS neck bushings, designed for gold medal match series dies, let you fine-tune bullet grip by controlling neck tension with surgical precision, which results in less brass fatigue, longer case life and improved accuracy. High-quality, uniform-thickness brass is required to fully benefit. To find the right bushing, subtract 0.002 - 0.003 inches from the outside neck diameter of a loaded round or double the neck wall thickness, add the bullet diameter and subtract 0.001 inches. RCBS advises keeping a small range of sizes on hand for best adaptability.

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