These self-aligning, changeable neck bushings work with RCBS gold medal match series dies to let reloaders adjust bullet seating tension with extreme accuracy, which prolongs case life and significantly improves accuracy by reducing brass fatigue at the neck. They require the use of premium brass with consistent neck wall thickness for best results. Proper sizing involves measuring a loaded round's outside neck diameter and subtracting 0.002 - 0.003 inches or doubling neck wall thickness, adding bullet diameter and subtracting 0.001 inches. It's best to have bushing sizes slightly above and below your target for tuning.

• Proudly made in the USA for superior quality and reliability