Achieving perfect headspace is vital for the safety and accuracy of your reloads. Lyman's rifle case length/headspace gauge is designed to give you peace of mind by ensuring all bottleneck rifle cases meet the proper specifications. After resizing, simply insert the case into the gauge to verify that it's within the allowable headspace range. The gauge also detects cases that surpass the maximum length. If excessive headspace is found, the case should be destroyed immediately. Lyman's precision gauges eliminate any guesswork, guaranteeing that your reloads are as safe and accurate as possible. Verifies case headspace Detects instances of prolonged duration