The classic dies that started it all continue to set industry standards. RCBS Precision dies are RCBS Precisioneered to deliver superior performance plus easy adjustment and operation, whether you reload 10 or 10,000 cartridges a year. 7mm Winchester Short Magnum Sets Feature: - Easy, adjustable expander-decapping unit locks in place, eliminating slippage - Three-piece expander/decapping unit lets you replace the decapping pin in a snap