The Hornley .338 Lapua Magnum Modified Case is a precision-engineered component designed for use with the Lock-N-Load O.A.L. Gauge to achieve optimal bullet seating depth and improved accuracy..338 Lapua Magnum Modified Case (SKU: C338L)Threaded case-head design for secure gauge attachment.002" oversized neck to accept actual bulletsPrecision measurements accurate to .001"Compatible with Lock-N-Load O.A.L. Gauge systemEssential for reloaders seeking to regulate the critical bullet-to-rifling relationship that can transform average accuracy into tack-driver performance. The oversized neck design ensures compatibility with your intended bullet types for the most accurate seating depth measurements.