RCBS SMALL BASE DIE SET .243

WINCHESTER FEATURES:-For bottleneck cases used in tight-chambering semi-automatic, pump or lever-action rifles.-The set consists of a Small Base Sizer Die w/ an Expander-Decapping Unit and REgular Seater Die w/ Seater Plug-The sizer resizes cases below SAAMI minimums, reducing the shoulder & body by a few thousandths-It also de-primes the case-The included Seater Die has a built-in roll crimper to secure the bullet at the same time it's seated-To seat bullets w/out crimping, simply unscrew the die until the crimp ring no longer engages the case mouth-.243 Remington