RCBS Shell Holder #21 303 Savage Single Stage

The RCBS Shell Holder #21 is a single-stage reloading shell holder machined from hardened steel and precision-sized to fit the .303 Savage case head. As part of RCBS's renowned line of removable shell holders, the #21 captures 0.125" of the case head to maintain proper SAAMI headspacing during resizing and decapping operations, ensuring consistent reloads round after round.

Each RCBS shell holder is numbered and cross-referenced to specific cartridge case dimensions, so the #21 is the correct choice for handloaders working with the classic .303 Savage. The shell holder drops into any standard RCBS single-stage press and provides the positive case retention needed for reliable sizing, with hardened steel construction that delivers long service life under repeated loading cycles.