The Lyman 416 Rigby Rifle 2-Die Set Is crafted On State Of The Art Computer Controlled Equipment insuring That Each Die Is perfectly dimensioned. Each Rifle Sizing Die Is vented To Prevent Trapped Air That Can Damage Cartridge Cases, Polished, Heat Treated For Toughness And then receives a Final Micro-Finish Polish For Extra Smoothness. Lyman 2 Die Rifle sets Is Perfect For Loading Jacketed Bullets In Bottleneck Cases.