RCBS X Die Full Length Die Set Features The RCBS X Die Full Length Die Set for .223 Rem solves one of reloading s most tedious chores case trimming by building the control directly into the sizing process. As the case is sized the mandrel makes contact with the case mouth and that contact limits how much the case can grow with each firing. Once the first trim takes 0.02 inches off the maximum case length the design keeps future growth in check so additional trims are rarely needed. This saves real time for anyone loading in volume for an AR platform or bolt gun chambered in .223 Rem. Because the tolerance between the neck wall and the mandrel is extremely tight the case is pushed back without thickening the neck wall the way conventional sizing dies often do. That means more consistent neck tension round after round which translates to more uniform bullet release and better accuracy downrange. The set includes the full length sizing die and seating die needed to load complete functional ammunition from once fired or new brass. Reloaders who process a lot of .223 Rem brass will appreciate how much bench time this set saves them. RCBS X Die Full Length Die Set Specifications Manufacturer: RCBS Model: X Die Full Length Die Set Caliber: .223 Rem Die Type: Rifle Set Available At: GrabAGun