Achieve precise bullet seating depth with the Hornady Lock-N-Load® OAL Gauge (Straight). One of the best kept secrets in accurate reloading is precise bullet seating depth. Regulating seating depth and the resulting "jump" to the rifling is widely regarded as fundamental to improved accuracy.Read more
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. Hornady® offers interchangeable modified cases in most common sizes from .17 Remington up to and including 500 Nitro. 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.