Achieve precise bullet seating depth for greater accuracy in your reloading. Regulating bullet seating depth and the resulting "jump" to the rifling is fundamental to improving accuracy and achieving consistent performance. Even a few thousandths of an inch change between the bullet and the rifling can significantly impact accuracy, transforming average results into "tack-driver" performance.

The Hornady Lock-N-Load® O.A.L. Gauge is a widely acclaimed, accurate, easy-to-use, and reliable method for determining this critical bullet-to-rifling relationship. It allows reloaders to precisely measure the cartridge overall length (O.A.L.) for their specific firearm, ensuring optimal bullet placement.

To utilise the Lock-N-Load® O.A.L. Gauge effectively, a calibre-specific Modified Case (sold separately) is required. This case fits your firearm's chamber and threads directly onto the gauge. Hornady offers an extensive range of interchangeable modified cases in most common sizes, from .17 Rem up to and including .500 Nitro. These specially prepared cases are threaded at the case-head and feature a .002" oversized neck, designed to accept the exact bullets you intend to load. This meticulous design ensures that the O.A.L. Gauge dimensions obtained are accurate to within .001", a level of precision not typically achieved with competitive products that often rely on simulated bullets with arbitrary shapes.

This Hornady Curved O.A.L. Gauge is specifically designed for use with autoloader, lever-action, and pump-action rifles. It is also suitable for bolt-action and single-shot firearms where it inserts conveniently through the ejection port, providing a precise and user-friendly measurement solution.