This two-die set is designed 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 brings the case to SAAMI minimum cartridge dimensions by resizing the case body, de-priming and expanding the neck to properly accept the bullet. It also features vents that help prevent case damage caused by trapped air or excessive lubricant. The headspace is maintained to strict tolerances, ensuring that the case body length remains unchanged during the full-length sizing process. The Seater Die includes a built-in roll crimper that secures the bullet while it is being seated, ensuring a reliable and consistent crimp with every reload.