RCBS 11131 Small Base Sizer Die .223 Rem - Group A

The RCBS 11131 Small Base Sizer Die is a precision reloading die from RCBS's Group A die series, purpose-built for bottleneck .223 Remington cartridge cases used in tight-chambering semi-automatic, pump, and lever-action rifles. Unlike a standard full-length sizer, this small base sizer resizes the case body below SAAMI minimum specifications and sets the case shoulder back slightly further, producing ammunition that feeds and chambers reliably in firearms with tight or finicky chambers.

Sold as a single die (one in the set), the 11131 brings .223 Rem cases down to a slightly smaller body diameter and provides a slightly more shoulder bump than a normal sizer, eliminating stubborn chambering issues in autoloaders and lever-action platforms. It pairs with the appropriate RCBS Group A seater die (sold separately) to complete a full .223 Rem reloading setup on any standard reloading press.

A go-to die for rifle reloaders who need consistent case sizing for tight-chamber .223 Rem firearms.

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