The Hornady Lock-N-Load .375 H&H Magnum Modified Case is specially engineered for precision reloading measurements with Lock-N-Load Precision gauges. Features a fine thread attachment system and perfectly rounded neck opening for accurate bullet seating depth measurements.Hornady Lock-N-Load .375 H&H Magnum Modified CaseSpecial fine thread for secure gauge attachmentPerfectly square alignment in firearm chamberRounded neck opening for effortless bullet insertionConcentric design ensures precise measurement resultsCompatible with Hornady Lock-N-Load Precision gaugesEssential for serious reloaders seeking maximum precision in cartridge overall length and bullet seating depth measurements for .375 H&H Magnum ammunition.