Hornady Lock-N-Load Modified Cases 50 BMG. jump? to the rifling is widely regarded as fundamental to improved accuracy. A few thousandths of an inch change between the bullet and the rifling can make the difference between average accuracy and real tack-driver performance. The Lock-N-Load O.A.L. Gauge is universally acclaimed as the most accurate easy-to-use and reliable method of obtaining that critical relationship. To use the Lock-N-Load O.A.L. Gauge you will need the Modified Case 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. Specifications for Hornady Lock-N-Load Modified Cases 50 BMG C50BMG: Manufacturer: Hornady Caliber: .50 BMG Additional Features: C Series Package Contents: Hornady Lock-N-Load Modified Cases 50 BMG C50BMG The Hornady Lock-N-Load Modified Cases 50 BMG C50BMG is a quality addition to the Hornady lineup. For more great deals on Reloading Measuring Tools by Hornady please browse our Hornady Reloading Equipment page. Hornady Lock-N-Load Modified Cases 50 BMG