The Gold Medal sizing die features a self centering changeable neck
bushing that allows you to precisely set the amount of tension on the
bullet. This reduces work hardening of the case neck brass, prolonging
case life and increasing accuracy. Neck bushings (not included) are
available in .001” increments from .189” to .365”. By removing the neck
bushing, the Full Length sizing die can be used as a “bump” die to set
headspace back the desired amount. Neck bushings are not included.
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. The Gold Medal seat dies features a
micrometer adjustable, free floating and self-centering bullet seating
system with a convenient bullet loading window. Includes: Full Length
Neck Bushing Sizer Die and seating die. Shellholder not included.
RCBS Gold Medal Match bushing dies will accept bushings made by Hornady, Redding
or Wilson in addition to RCBS bushings.