Get tighter groups and longer case life with these self-centering RCBS neck bushings, crafted for gold medal match series dies to help you precisely adjust bullet tension. By reducing neck stress during sizing, they reduce work hardening of the brass, but consistent neck wall thickness in your brass is key. To find the right size, measure the outside neck diameter of a loaded round and subtract 0.002 - 0.003 inches or multiply neck wall thickness by two, add the bullet diameter, then subtract 0.001 inches. RCBS advises keeping bushings within a two-size range around your ideal.

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