Hornady Lock-N-Load O.A.L. Gauge Curved Multi-Caliber

The Hornady Lock-N-Load O.A.L. Gauge (Curved) is a precision reloading tool used to measure cartridge overall length by simulating the internal dimensions of a rifle chamber. The curved configuration is engineered to insert through the ejection port of autoloader, lever-action, and pump-action rifles, and it also fits all bolt-action and single-shot firearms.

This gauge covers an exceptionally broad caliber range, working with cartridges from .17 Remington up through 500 Nitro for nearly any rifle reloading application. Finished in red, the unit weighs just 0.22 lbs for easy benchtop use. The gauge body accepts Hornady Lock-N-Load modified case inserts (sold separately) for each individual caliber, giving reloaders a repeatable, rifle-specific seating reference for safety, accuracy, and reliable feeding.

An OAL gauge is an essential tool for any handloader: by replicating the chamber of a specific rifle, it allows the reloader to seat bullets to the optimal depth and reproduce accurate handloads across a wide variety of platforms. Whether you are loading for a semi-auto, pump, lever, or bolt rifle, this curved gauge provides a consistent baseline for developing and tuning handloads.

Note: The curved OAL gauge is not compatible with Hornady Adapter "D" or similar adapters intended for the straight gauge configuration.