AR SERIES DIE SET - .204 Ruger a Features small base (SB) sizing die & taper crimp (T/C) seater die a Makes reloading easier for AR-style or semi-auto shooters a Small base sizer guarantees cartridge will rechamber a Taper crimp seater is more forgiving when various case lengths are loaded at the same time a Case neck crimp bulges & buckled shoulders are eliminated when taper crimping is used w/cannelured bullets