This two-die set is designed specifically for reloading bottleneck cases and includes a Full-Length Sizer Die with an Expander-Decapping Unit and a Seater Die with a Bullet Seater Plug. The Full-Length Sizer Die ensures the case is resized to SAAMI minimum cartridge dimensions. It resizes the case body, de-primes and expands the neck to properly accept the bullet. The die features vents to prevent damage caused by trapped air or excessive lubricant. It also maintains headspace within minimum tolerances, ensuring the case body length remains unchanged during the sizing process. The included Seater Die comes with a built-in roll crimper, which securely seats and crimps the bullet simultaneously for a reliable, consistent hold.