The Lyman Case Length/Headspace Gauge for 6.5 Grendel is an essential precision tool for safe and accurate rifle reloading ensuring proper headspace dimensions and case length measurements.Lyman Case Length/Headspace Gauge - 6.5 Grendel caliberInspects bottleneck rifle cases after resizing for proper headspaceVerifies cases don't exceed maximum or fall below minimum allowable dimensionsIdentifies cases that exceed maximum allowable case lengthSimple insert-and-check operation for quick inspectionEssential safety tool for detecting excessive headspace casesRecommended by Lyman for achieving the highest degree of safety and accuracy in rifle reloading this gauge eliminates guesswork and ensures your 6.5 Grendel cases meet proper specifications before loading.