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.
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