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: Bushing Neck 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.