RCBS Full-Length Die Sets are precision-engineered from proprietary die steel, machined to exacting tolerances and undergo a thorough finishing process to deliver the highest quality dies available for hand-loaders. Each set includes a Full-Length Sizer Die and a Bullet Seating Die, specifically designed for reloading bottleneck cases. The Full-Length Sizer Die comes equipped with an Expander-Decapping Unit to size the outside of the case, de-prime and expand the neck to the correct diameter for bullet seating. Vents are built-into the die to prevent case damage caused by trapped air or excess lubricant, while headspace is carefully controlled to minimize changes to the case body length during sizing. The included Seater Die features a Bullet Seater Plug and a built-in roll crimper, ensuring the bullet is securely seated and properly crimped, providing consistent and reliable ammunition every time.