If you're a competitive marksman measuring success in fractions of a millimeter, RCBS Competition dies are for you. Competition Rifle two-die sets feature a full-length sizer with a raised expander ball allowing extra leverage for smooth, effortless neck expansion. The seater die features a micrometer bullet-seating head that has super-accurate 0.001" adjustments. Bullets insert through a side window instead of bottom of die. A special bullet-seating sleeve ensures correct bullet alignment before and after seating. (Not for use with progressive reloading presses.) Includes: full-length sizer and competition bullet seater die. Shellholder sold separately.