Neck Bushing Size (RCBS instructions): Proper neck bushing size can be determined two ways. Measure the outside neck diameter of your loaded cartridge, subtract .002" to .003". This allows approximately .001" of brass spring back for correct neck tension. The other is to measure the neck wall thickness of your case, multiply by two, add the diameter of your bullet and subtract .001". RCBS suggests that you have neck bushings one to two sizes above and below your target diameter.
Notes:
For use with RCBS Gold Medal Match series dies, works in both the full length and neck sizing styles. Redding, Wilson and Hornady bushings may also be used in RCBS Gold Medal bushing dies.
81579 - .264 Steel Neck Bushing
81580 - .265 Steel Neck Bushing
81581 - .266 Steel Neck Bushing
81582 - .267 Steel Neck Bushing
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