RCBS Die .223 Remington Small Base Sizer Die 11131 The Small Base Sizer Die is for bottleneck type cases used in tight-chambering semi-automatic, pump or lever-action firearms. The sizer resizes cases below SAAMI minimums, reducing the shoulder and body by a few thousandths. It also de-primes the case. Note: Not recommended for ammunition used in bolt-action rifles Small Base Sizer .223 Rem Small base set contains small base sizer with expander-decapping unit and regular seater die with seater plug.
