HORNADY STRAIGHT O.A.L GAUGE

To use the Lock‑N‑Load® O.A.L. Gauge, you will need a Modified Case (sold separately) to fit your firearm’s chamber and thread it onto the gauge. These specially prepared modified cases are threaded at the case‑head and have a .002″ oversized neck to accept the same bullets you intend to load.

This is critical, as the Lock‑N‑Load® O.A.L. Gauge dimensions obtained will be accurate to .001″. These results cannot be attained with competitive products, which use a simulated bullet with an arbitrary shape.