The Hornady .17 Hornet Modified Case is specially engineered to work with Lock-N-Load Precision gauges for accurate cartridge measurements and reloading precision.Hornady .17 Hornet Modified Case (SKU: A17H)Special fine thread attachment for Lock-N-Load Precision gaugesPerfectly squared case ensures precise chamber alignmentModified neck made perfectly round with slight openingAllows standard diameter bullets to slip in effortlessly and concentricallyDesigned for maximum measurement precisionEssential for serious reloaders and precision shooters who demand accurate cartridge overall length measurements and consistent ammunition performance with .17 Hornet firearms.