How to Use a Gun Case Gauge

When reloading ammunition, it is important to be sure that the casings you are using are in the proper shape for your firearm to help prevent misfires or other malfunctions when using your firearm. By properly calibrating and using your case gauge, you can ensure that all casings are up to snuff.

Things You'll Need

• Case Guage
• Empty Bullet Casing
• Case Trimmer

Instructions

1. Drop the casing into the gauge.

2. Identify the high step and low step on both ends of the gauge. As the names imply, the high step will be the higher of the two lips on a respective end of the gauge.

3. Note where the base of the casing sits relative to the steps, and remove the casing.

4. Turn the sizing die clockwise if the casing is sitting above the high step.

5. Turn the sizing die counterclockwise if the casing is sitting below the low step.

6. Insert the case back into the case gauge.

7. Note where the case mouth sits relative to the high and low steps on the mouth end of the gauge.

8. Trim the casing with a case trimmer if the mouth of the casing rests above the high step so that the casing mouth ends between the high step and the low step.

Tips & Warnings

• Case gauges are caliber specific, so be sure your gauge is the correct caliber for your firearm's ammunition.