The RCBS Chamber/Cartridge Length Gauge for .300 AAC BLACKOUT is a simple, purpose-built check gauge for handloaders and gunsmiths. It accepts a loaded round to confirm proper chambering and to check overall cartridge length. The gauge from RCBS performs double duty for chamber verification and cartridge-length measurement. RCBS supports this product with a Limited Lifetime Warranty.
Key Specifications
- Product type: Chamber/Cartridge Length Gauge.
- Caliber: .300 AAC BLACKOUT.
- Primary function: Checks chambering and cartridge length for handloaded rounds.
- Manufacturer: RCBS.
- Warranty: Limited Lifetime Warranty.
- Listed weight: 0.28.
- Listed shipping weight: 0.28.
This compact gauge streamlines routine inspection and ammunition setup for reloaders and bench gunsmiths working with .300 AAC Blackout. Its straightforward design and factory warranty make it a practical tool for verifying chamber fit and cartridge overall length during load development and maintenance.









