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If you're loading 338 Norma Mag and want brass that chambers clean and lasts, this is the little tool that earns its keep on the bench. The L.E. Wilson Case Gage is a one-piece, precision machined gage that checks both headspace and case length on fired and resized brass. No guesswork, no complicated setup. You drop a case in, read the steps, and you know where you stand.
This gage measures two things that matter most to a handloader: datum-to-head length (your headspace) and overall case length (your trim point). The design lets you see exactly how much you're setting the shoulder back when you size, which is the whole game when you're chasing accuracy and brass life. Check a case in its as-fired state first, note the headspace, then resize and drop it back in to see your shoulder movement. The goal most precision guys aim for is a 0.001 to 0.002 inch setback behind your chamber, which keeps the case fit tight without overworking the brass.
Over-sizing is one of the quickest ways to shorten the life of expensive magnum brass and invite case head separation, and that's exactly what this gage helps you dodge. Flip it over on a flat surface and you can read min and max trim length by sliding a straight edge across the steps. If the mouth clips the high step, it's time to trim. It's dead simple, repeatable, and doesn't rely on you interpreting a bunch of caliper numbers.
L.E. Wilson has been a family-run operation since 1927 and invented the original cartridge case gage back in 1935, so there's a long track record behind this design. One thing to keep in mind: this gage does not measure body diameters, and it's meant to be used with fired cases as the baseline for your full-length sizing and trimming. For the most precise headspace readings, pair it with a Wilson Case Gage Depth Micrometer.
It checks two things on your brass: headspace (the datum-to-head length) and overall case length. You drop a case in to read shoulder position against the min and max steps, then flip it over on a flat surface to check trim length. It does not measure body diameters.
Measure a case in its as-fired condition and note the headspace reading first. Resize it with your current die setting, drop it back in the gage, and see how far the shoulder moved. Dial your die in until you get roughly a 0.001 to 0.002 inch setback, which keeps the case snug in the chamber without overworking the brass.
You can read the min and max steps by eye or with a straight edge for a quick pass or fail check, which is part of what makes this gage so handy. For precise headspace numbers, L.E. Wilson recommends pairing it with their Case Gage Depth Micrometer. Either way works depending on how exact you want to get.
Yes, it's designed to be used with fired cases as your baseline and then with resized cases to confirm your work. Just note that if a case is over max headspace, you won't get an accurate length reading until it's sized down to at least max headspace.
| UPC | 815145028884 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CG-338NM |
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