RCBS Full-Length Die Sets are crafted from our proprietary die steel to meet the highest standards of precision and quality. Each set includes a Full-Length Sizing Die and Bullet Seating Die, both designed for reloading bottleneck cases. The Full-Length Sizer Die, complete with an Expander-Decapping Unit, ensures that your cases meet SAAMI minimum cartridge dimensions. This die sizes the case, de-primes and expands the neck to accept the bullet, while vents help to prevent damage from trapped air or excess lubricant. The precise tolerances maintain headspace, ensuring the case body length remains unaffected during sizing. The Seater Die comes equipped with a built-in roll crimper that secures the bullet while seating it, ensuring consistent performance and reliability.