RCBS X Die Full Length Die Set Features The RCBS X Die Full Length Die Set is built for the .338 Win Mag cartridge and solves one of handloading s most tedious chores repeated case trimming. The X Die Sizer uses a specially designed mandrel with an expander ball and decapping pin attached and its patented design eliminates the need for repeated trimming after an initial trim of .020 inch off the maximum case length. Because of an extremely close tolerance between the mandrel and die neck wall the case neck wall does not thicken as the case length is pushed back during sizing. Cases sized repeatedly in the X Die will initially grow a few thousandths of an inch and then stabilize below maximum length all without any discernible loss of accuracy or case life. Unlike a standard full length die the X Die mandrel reduces the case growth caused by the mouth contacting the mandrel during sizing rather than shortening the case outright. This set includes a Standard Seater Die alongside the X Die Sizer giving reloaders everything needed to size deprime and seat bullets in .338 Win Mag brass. Reloaders who already own a conventional die set for this caliber can order just the X Die Full Length Sizer on its own to add this case-life benefit to their existing setup. For .338 Win Mag handloaders tired of constant trim maintenance the RCBS X Die Full Length Die Set is a time saving solution for sale at GrabAGun. RCBS X Die Full Length Die Set Specifications Manufacturer: RCBS Model: X Die Full Length Die Set Caliber: .338 Win Mag Die Type: Rifle Set Available At: GrabAGun