RCBS has been making some of the best reloading equipment for over 60 years. RCBS was founded in 1943 by Fred T. Huntington in Oroville, California. By 1958, RCBS was expanding into a 7,500-square-foot factory. To this day, RCBS is the leading manufacturer of ammunition reloading equipment throughout the world. The Neck Sizer Die features an Expander-Decapping Unit. It resizes the case neck only (it doesn’t touch the shoulder or body) and de-primes.