RCBS Full-Length Die Sets are crafted from proprietary die steel, ensuring superior durability and precision for hand-loaders. These sets include a Full-Length sizing die and Bullet Seating Die, designed for reloading bottleneck cases. The Full-Length Sizer Die features an Expander-Decapping Unit and sizes the case to SAAMI minimum cartridge dimensions, de-priming and expanding the neck to properly seat the bullet. Vents are incorporated to prevent case damage from trapped air and excess lubricant. The die maintains precise headspace tolerances to prevent altering the case body length during sizing. The Seater Die comes with a built-in roll crimper to securely seat the bullet while ensuring a tight, consistent crimp for reliable performance.