RCBS 204 Ruger Neck B SizeR Neck Sizer Die

These Neck Sizer Dies use precision-machined neck bushings (sold separately) to size the case neck just enough provide the exact amount of bullet tension without overworking the brass. To determine the proper neck bushing size measure the outside neck diameter of a loaded cartridge and subtract .002 to .003 to allow for a small amount of brass spring back. Shellholder sold separately.