Lyman’s case length/headspace gauge is the best way to check this critical dimension—simply insert the case into the gauge to ensure it does not exceed the maximum or fall below the minimum allowable headspace. The gauge will also identify a case which exceeds the maximum allowable case length. Constructed from steel, this gauge is calibrated for the 300 AAC Blackout (7.62x35mm) cartridge.
To achieve the highest degree of safety and accuracy, Lyman recommends that all bottleneck rifle cases be inspected after resizing to ensure that the proper headspace dimension is maintained. this tool eliminates guesswork from the reloading process. Any case found with excessive headspace should be destroyed immediately to prevent dangerous malfunctions.
Lyman’s Rifle Case Length Headspace Gauges will eliminate the guesswork with rifle reloading. A simple, effective quality-control step for reloaders who demand consistency and safety in every round.
