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The RCBS 12001 is a two-die set designed specifically for the reloading of bottleneck cases. This set contains a Full-Length Sizer Die equipped with an Expander-Decapping Unit, and a Seater Die that comes with a Bullet Seater Plug. The Full-Length Sizer Die ensures the case aligns with the Saami minimum cartridge dimensions, effectively resizing the case's exterior, de-priming and widening the neck to accommodate the bullet. Notably, it includes vents designed to avert case damage due to trapped air and excess lubricant. To maintain consistency and prevent alterations to the case body length, the headspace is kept within stringent tolerances during full length sizing. The provided Seater Die features a built-in roll crimper, which simultaneously seats and secures the bullet.