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If you're loading for the 30-40 Krag, this is the little tool that keeps your brass honest. The L.E. Wilson Case Gage is a one-piece, non-adjustable cylinder machined to tight tolerances, and it does two jobs that matter most on a rimmed cartridge like the Krag: it checks your headspace and it flags when your cases need trimming. Drop a fired or resized case in, run a straight edge or caliper across the top, and you've got a quick, repeatable read on where your brass stands against min and max dimensions.
The real value here is dialing in your full length sizing die. A common mistake reloaders make is pushing the shoulder back too far, which overworks the brass and shortens case life fast. By measuring a case in as-fired condition, sizing it, then dropping it back into the gage, you can see exactly how much you're moving the shoulder and back your die off until it's just right. That means longer-lived brass and fewer worries about case separation down the road.
Along with headspace, the gage reads minimum and maximum case length so you know when it's time to trim. Keep in mind it does not measure body diameters, so pair it with a caliper for the full picture. It's built to be used with fired cases to give you a solid baseline for sizing and trimming decisions.
L.E. Wilson has been making precision reloading tools since 1927, and they invented the case gage back in 1935 to solve a case separation problem. That heritage shows in the fit and finish. This is a tool that gets dropped in a drawer, pulled out hundreds of times, and keeps giving you the same accurate read year after year. For a vintage cartridge like the Krag that often sees older rifles with generous chambers, having a gage to keep your loads in check is worth every bit of bench space it takes up.
It reads two things: your case headspace and your overall case length. Drop a case in and you can tell whether your sizing die is set correctly and whether the brass has grown long enough to need trimming. It does not measure case body diameters, so keep a caliper handy for that.
Both, and that's the point. Start with a case in as-fired condition to get a baseline, then resize it and drop it back in to see how far you pushed the shoulder. Comparing the two lets you fine-tune your full length sizing die so you're not overworking the brass.
Yes. The gage is machined to standard cartridge dimensions, which makes it especially useful with older Krag rifles that sometimes have roomier chambers. It gives you a reliable reference so your reloaded brass stays within spec regardless of the individual rifle.
Set the case or the gage on a flat surface and run a straight edge or caliper across the top to compare the case against the gage's step surfaces. If the case sits within the min and max marks, you're good. If it protrudes past max, that points to excess headspace or a case that needs attention.
| UPC | 857949005579 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CG-3040 |
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