by brett1868 » 20 Jun 2018, 10:24 pm
The numbers on the back can be used to calculate threads based on measuring the distance between the grooves. It's an old school instrument and next to useless for reloading unless used in conjunction with a surface plate. As suggested, throw it back in a corner and buy a good set of Vernier's as they are more reliable and easier to use when measuring for reloading.
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