RCBS 0.334" Neck Bushing

Built to fit RCBS gold medal match series dies, these adjustable neck bushings center themselves and allow reloaders to precisely control neck tension. This process slows down neck brass work hardening, improving accuracy and extending case life. Precision requires consistent neck thickness, so use only high-grade brass. Two sizing methods exist - subtract 0.002 - 0.003 inches from the loaded cartridge's neck diameter or double the neck wall thickness, add the bullet diameter and subtract 0.001 inches. RCBS encourages users to keep multiple bushing sizes close to the target. Proudly made in the USA for superior quality and reliability