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 that the case is resized to meet SAAMI minimum cartridge dimensions, resizing the case body, de-priming and expanding the neck to accept the bullet. The die features vents to prevent damage caused by trapped air and excessive lubricant. It also maintains headspace within minimum tolerances to prevent changes to the case body length during the full-length sizing process. The included Seater Die has a built-in roll crimper, which securely seats and crimps the bullet at the same time, ensuring consistent and reliable performance.