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 resizes the case to meet SAAMI minimum cartridge dimensions. It resizes the case body, de-primes and expands the neck to ensure proper bullet seating. The die features vents to prevent damage from trapped air and excessive lubricant. Headspace is maintained within strict tolerances to avoid altering the case body length during the full-length sizing process. The included Seater Die has a built-in roll crimper, securing the bullet while it is being seated, ensuring a reliable and consistent crimp for optimal performance.