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 Bullet Seater Plug(s) for seating and crimping the bullet. These dies are designed to be used with round nose bullets.
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