Redding Small Base Body Dies were designed to full length resize the case body and bump the shoulder without disturbing the case neck. The Small Base Body Dies are for use with firearms with custom chamberings that are tighter than  Specifications. For precise control of the amount of shoulder bump, Redding Competition Shellholders are recommended. Due to the fact that this product sizes more than regular dies, it is crucial to have a sufficient amount of high quality lubricant to prevent stuck cases. Not for use with loaded ammuniti