The RCBS .223 Winchester Super Short Magnum Full Length Die Set is a precision 2-die reloading set designed for bottleneck case reloading with SAAMI minimum cartridge dimensions for consistent accurate ammunition.RCBS .223 WSSM Full Length Die Set (SKU: 10501)2-die set: Full-Length Sizer Die with Expander-Decapping Unit and Seater Die with Bullet Seater PlugFull-length sizing brings cases to SAAMI minimum cartridge dimensionsBuilt-in roll crimper secures bullet during seating processVented design prevents case damage from trapped air and excess lubricantMinimum tolerance headspace maintains proper case body lengthSteel construction (non-carbide)Essential for precision reloaders working with .223 Winchester Super Short Magnum cartridges this die set ensures consistent case preparation and bullet seating for optimal performance and accuracy.