For reloaders looking to achieve the highest levels of safety and performance, Lyman's case length/headspace gauge offers a critical inspection tool. After resizing bottleneck rifle cases, this gauge ensures the headspace remains within the ideal range. It's as simple as inserting the resized case, and the gauge will verify that it doesn't exceed the maximum or fall below the minimum headspace limits. The gauge also identifies cases that exceed the allowable case length. If excessive headspace is detected, dispose of the case immediately. Lyman's gauges provide the precision and peace of mind every reloader needs for flawless ammunition. Verifies case headspace Detects instances of prolonged duration