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The L.E. Wilson 30-40 Krag case gage is a single-piece measuring tool built to help 30-40 Krag reloaders set up full length resizing dies correctly and verify that fired brass meets proper headspace specs. If you're loading for the Krag, you already know that oversizing brass during the resizing process wears out your cases fast—and this gage puts the fix in your hands. By checking both overall length and datum-to-head length, you can catch cases that need trimming before they hit the press, then dial in your 7/8"-14 press type die to the exact headspace your rifle demands.
Precision headspace is the foundation of safe, consistent ammunition, and it's surprisingly easy to get wrong with aftermarket brass or when switching between rifles. This gage lets you measure fired cases individually with a caliper rather than guessing based on feel or relying on generic die settings. The result: tighter case life, better brass longevity, and ammo that chambers smoothly without excess force.
L.E. Wilson gages have been the standard in precision reloading shops for decades because they're straightforward, durable, and accurate. The knurled middle section gives you a secure grip, and the compact design sits easily on a reloading bench or in a powder measure drawer. If you're serious about 30-40 Krag ammunition and want to avoid the common pitfall of oversized brass, this gage belongs in your kit.
| Brand | L.E. Wilson |
| Caliber | 30-40 Krag |
| Type | Case Gage |
| Configuration | One-piece |
| Overall Length | 2.494" |
| Large End ID | .473" |
| Small End ID | .347" |
| Outer Diameter | .991" |
| Finish | Silver with knurled middle section |
| Contents | Gage and instructions |
A case gage measures fired brass to verify headspace and overall length, helping you set up your full length resizing die correctly and identify cases that need trimming. This prevents the common error of over-sizing brass, which drastically shortens case life.
Insert your fired case into the gage and measure with a caliper to check datum-to-head length (for headspace) and overall length (to identify trim needs). The gage's internal shoulders align your brass for consistent, accurate measurements. Detailed instructions are included with the tool.
The package contains the one-piece gage and instruction sheet in a cardboard box.
Yes, you'll need a caliper to measure the brass against the gage. Any standard dial or digital caliper works well.

SKU: 197558584 • Weight: 0.45oz