Hornady Lock-N-Load Modified B Case Features The Hornady Lock-N-Load Modified Case for 7mm PRC is manufactured to SAAMI specifications ensuring it matches the chamber dimensions a reloader would encounter with factory produced brass. This modified case is designed to work in conjunction with the Hornady Lock-N-Load Overall Length Gauge allowing precise measurement of where a bullet s ogive contacts the lands of the rifling in a specific barrel. Knowing this measurement lets reloaders set seating depth with far more precision than guessing from published load data alone. Because it is built from brass the modified case handles repeated insertion and measurement cycles without excessive wear. This tool is especially valuable for precision rifle shooters and long range hunters chambered in 7mm PRC who want to optimize seating depth for accuracy rather than relying solely on SAAMI maximum overall length specifications. Since chamber dimensions vary slightly between individual rifles even within the same cartridge a modified case calibrated to the specific chambering gives more reliable repeatable results than a generic comparator. Reloaders focused on extracting maximum accuracy from their 7mm PRC rifle will find this an essential step in their load development process. The gauge itself is sold separately so this modified case should be paired with an existing Lock-N-Load Overall Length Gauge for full functionality. Hornady Lock-N-Load Modified B Case Specifications Manufacturer: Hornady Model: Lock-N-Load Modified B Case Caliber: 7mm PRC Material: Brass Available At: GrabAGun