4 Caliber Auto Case Gauge Ammo Checker - 9mm, .40 S&W/10mm, .45 ACP & .38 Super

Why Use an EGW Case Gauge?

• ✔ Check four common handgun calibers with one gauge
• ✔ Verify resized brass before loading
• ✔ Check loaded ammunition for proper chamber fit
• ✔ Help identify oversized, bulged, or improperly resized cases
• ✔ Help verify proper bullet seating depth
• ✔ Reduce ammunition-related issues before range day or competition
• ✔ Made in the USA by EGW

Checking Case Length

Auto pistol cartridges headspace on the case mouth and not the case rim as revolver cartridges do. To make certain your cases are not too long, follow the steps below:

1. Resize and deprime the case.
2. Drop the case inside the correct hole in the case gauge.
3. If the case is flush with the top of the gauge, the case does not need trimming.
4. If the case protrudes above the gauge, trimming may be required.

Checking Proper Bullet Seating Depth

1. Install the bullet into a correct length case and drop it into the gauge.
2. If the case is flush with the top of the gauge, the seating depth is correct for that bullet shape, style, length, and weight.
3. If the case protrudes slightly, remove the cartridge and seat the bullet slightly deeper into the case, then check it again.
4. With the cartridge still in the gauge, hold it in place with your finger and turn the gauge over.
5. The tip of the bullet should not protrude beyond the bottom of the gauge.
6. If the case has been properly resized, the length is correct, and the bullet is seated properly, the cartridge should fall out of the gauge by gravity alone.

Important Reloading Notes

We have found our gauges extremely helpful when reloading ammunition. The information above is general reloading guidance and is not caliber specific. Always consult your reloading manual and follow safe reloading practices.