L.E. Wilson Case Length Headspace Gauge, 6MM BR (Bench Rest) Short
Inherent with reloading is the potential to oversize your bottleneck rifle brass. And the most important use of a cartridge case gauge is for setting up 7⁄8"-14 press type full length resizing dies. Headspace of fired rifle cases can quickly and accurately be measured using this tool with a caliper.
This one piece gauge will check overall length to indicate a need for trimming and datum to head length to assure correct headspace to prevent over sizing.