The Lyman Neck Expanding Die is engineered to improve the accuracy of your .223 Remington and .223 WSSM jacketed and cast bullet reloads through superior case neck preparation.Lyman .223 Rem/.223 WSSM Neck Expanding DieDesigned for rifle cartridge reloadingImproves accuracy of jacketed and cast bullet loadsSuperior neck expansion vs. standard expander button diesProperly expands case necks without excessive stretchingPerfect for precision reloaders seeking enhanced accuracy and consistent bullet seating in .223 Remington and .223 WSSM cartridges.