RCBS Gold Medal Match Bushing Full Length Sizer Die for .223 Winchester Super Short Magnum

The RCBS Gold Medal Match Bushing Full Length Sizer Die for .223 Winchester Super Short Magnum 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. By removing the neck bushing, the Full Length sizing die can be used as a "bump" die to set headspace back the desired amount without disturbing the case neck. Shellholder sold separately.