RCBS specializes in offering a complete line of reloading supplies for the home hand loader. RCBS Reloader Supplies set the standard for high-quality reloading equipment - just as they've done for over 60 years. With six decades of experience under their belt, RCBS knows all the ins and outs of the gear used by the home ammunition reloader. RCBS pioneered and developed the 3-Die Sets for straight-wall rifle and pistol cases. In the 3-Die Set sizing and expanding (belling) are done in separate dies. The 3-Die Set has a Sizer Die with Decapping Unit, Expander Die for expanding and belling the case mouth and a Seater Die with Roll or Taper Crimp and Bullet Seater Plug(s) for seating and crimping the bullet.