Unlike other case gauges, ours is cut with an actual match chamber finish reamer so it not only checks head space but also case diameter. A common problem for reloaders with high-grade rifles with tight chambers is out-of-spec ammo that will not go into battery. If you have a high-grade barrel with a tight chamber, this is the only sure way of assuring that your ammo is compatible. Most gauges only check head space. Some also indicate minimum and maximum case length. Only the JP gauge checks min/max headspace, min/max case length and case diameter relative to typical match-grade chambers.
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