RCBS Full-Length Die Sets are precision-engineered from our proprietary die steel to meet exacting tolerances, ensuring exceptional performance for hand-loaders. Each set includes a Full-Length Sizing Die and Bullet Seating Die, designed for reloading bottleneck cases. The Full-Length Sizer Die features an Expander-Decapping Unit that sizes the case exterior, de-primes and expands the neck to precisely fit the bullet. It also includes vents to eliminate the risk of case damage from trapped air and excess lubricant. Headspace is controlled within minimum tolerances to prevent alterations to the case body length during the sizing process. The Seater Die is equipped with a Bullet Seater Plug and a built-in roll crimper, securing the bullet as it's seated.