The RCBS 22401 is a two-die set designed specifically for the reloading of bottleneck cases. The set includes a Full-Length Sizer Die, complete with an Expander-Decapping Unit, along with a Seater Die that comes with a Bullet Seater Plug. The Full-Length Sizer Die adjusts the case to adhere to Saami minimum cartridge dimensions. Its functions are varied, taking care of the external sizing of the case, de-priming and neck expansion to fit the bullet. The die comes equipped with vents, designed to prevent any damage to the case brought about by trapped air or excessive lubricant. It also ensures that headspace is maintained within minimal tolerances to prevent any alteration to the case body length during the full length sizing process. The package further includes a Seater Die which comes with an incorporated roll crimper, allowing for the bullet to be locked in place as it\'s being seated.