A must for the progressive loader. It features a Small Nase sizing die and a new Taper Crimp Die. This combination makes reloading easier for AR-style or semi-auto shooters. The Small Base sizer guarantees that the cartridge will rechamber. The Taper Crimp Seater is more forgiving when various case lengths are loaded at the same time. Case neck crimp bulges and buckled shoulders are virtually eliminated when Taper crimping is used with cannelured bullets.