This 2-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, resizing the outside of the case, de-priming and expanding the neck to accept the bullet. The die also has vents to prevent case damage caused by trapped air and excessive lubricant. It maintains precise headspace tolerances to avoid altering the case length during the resizing process. The Seater Die features a built-in roll crimper to securely crimp the bullet as it's seated. This set ensures proper and accurate reloading of bottleneck cases.