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.

Specifications and Features:
RCBS Small Base Rifle Die
..224 Valkyrie
Recommended for semi-automatic firearms
Standard 7/8"-14 thread pitch