The RCBS Small Base Sizer Die is a single sizer designed for reloading bottleneck rifle cases in .223 Remington/5.56 NATO. It reduces shoulder and body dimensions by a few thousandths to assist reliable function in tight-chambering semi-automatic, pump, and lever-action firearms and includes an expander-decapping unit to remove spent primers. This die is intended for reloading operations and is not recommended for ammunition used in bolt-action rifles.
Key Specifications
- The die is specified for .223 Rem/5.56 NATO cartridge cases.
- The set contains 1 die.
- This is a Sizer Die intended to reduce shoulder and body dimensions slightly below SAAMI minimums.
- The product type is a Small Base sizer.
- The unit includes an expander-decapping feature that de-primes cases during sizing.
- Construction does not use carbide, listed as No for carbide.
- Dimensions are listed as 1.75 x 4.50 x 6.00 inches in the manufacturer data.
- Shellholder is sold separately (not included with the die).
- This die is not recommended for bolt-action rifles.
Engineered for reloaders who need reliable sizing for tight chambers, this RCBS Small Base Sizer Die provides a straightforward solution for preparing .223 Rem/5.56 NATO cases for use in semi-automatic, pump, and lever-action firearms. Its single-die format makes it a practical addition to a reloading bench for those focusing on reliable function and consistent case prep.
This description was generated with AI and may contain errors. Verify specifications and legal restrictions with the manufacturer before purchase. Provided “as-is” without warranties or guarantees.





