This 2-Die Set is crafted 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 simultaneously de-priming and expanding the neck to allow the bullet to be seated correctly. The die incorporates vents to prevent damage caused by trapped air or excess lubricant. With headspace held to precise minimum tolerances, it ensures no change to the case body length during the sizing process. The Seater Die features a built-in roll crimper, which securely crimps the bullet in place as it is seated, ensuring a tight, reliable fit. This set is an ideal solution for reloading bottleneck cases, offering consistent, high-quality results.