This two-die set is specifically 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 resizes the case to SAAMI minimum cartridge dimensions, ensuring the outside of the case is properly sized, while also de-priming and expanding the neck to accept the bullet. The die is equipped with vents to prevent case damage caused by trapped air or excessive lubricant. It maintains headspace within minimum tolerances to avoid altering the case body length during the full-length sizing process. The Seater Die includes a built-in roll crimper that simultaneously secures the bullet while it is being seated, providing a consistent and reliable crimp for optimal performance.