Designed for use with straight-wall rifle and pistol cases, the RCBS .380 Automatic 3-Die Carbide Taper Crimp Set eliminates the need for case lubrication and cleaning before sizing and includes a sizer die with a decapping unit, an expander die for expanding and belling the case mouth and a seater die with a taper crimp and a bullet seater plug. RCBS .380 Automatic 3-Die Carbide Taper Crimp Set - Reloading at Academy Sports