Ballistic Tools Case Mouth Gauge 25/6.5/7mm

The Ballistic Tools Case Mouth Gauge is a case mouth and tension gauge, telling you exactly how much neck tension your reloads will have.

Measuring neck diameter with calipers can be iffy, at best. Placing too much tension on the calipers, a slight angle to the caliper or a small burr on your case mouth can and will distort readings significantly.

Use of this case mouth gauge solves those problems.

If the gauge will not insert, neck tension is excessive and may cause seating problems. Use moderate pressure when gauging to ensure you are on the correct stop.

This case mouth gauge is quick and reliable and, for most, is a tool that they cannot do without.