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The L.E. Wilson Case Gage for .308 Win. is one of those small tools that earns a permanent spot on your reloading bench. It's a one-piece, non-adjustable steel gage that checks both case length and headspace, so you can tell at a glance whether a case needs trimming and how much your sizing die is actually bumping the shoulder. Drop a fired or resized case in, set it on a flat surface head-down, and read across the top. That's really all there is to it.
What makes this gage useful is that it compares your brass against the minimum SAAMI chamber dimensions. If the case sits proud of the max headspace step, your chamber runs a bit generous, which is handy information on its own. If it sits low, you've got room before trimming becomes an issue. Pair it with a caliper or the L.E. Wilson Case Gage Depth Micrometer and you can measure exactly how far the shoulder moves between fired and resized, which is the kind of feedback that keeps you from overworking brass and cutting its life short.
Overworking bottleneck brass is one of the quickest ways to cause case head separation, and this gage was built to prevent exactly that. Wilson's founder, Sam Wilson, actually invented the original cartridge case gage back in 1935 after a fellow handloader came to him with a case separation problem. Nearly a century later the design is still doing the same job, and the company has kept its reputation for precision tooling intact.
The real payoff shows up when you're setting up a full-length sizing die. Measure a case in the as-fired state, resize it, then check it again to see how much shoulder bump you're getting. Nudge the die until you're bumping just a few thousandths and you'll get brass that chambers smooth and lasts longer. One thing worth noting: this gage checks length and headspace, not body diameters. Machined from steel and made in the USA, it's built to stay accurate for a very long time.
Drop a fired or resized case into the gage, then set it head-down on a flat surface. Look across the top of the gage to read whether the case falls within the min and max marks for both length and headspace. For precise shoulder bump measurements, use it alongside a caliper or the L.E. Wilson Case Gage Depth Micrometer.
No, this gage checks case length and headspace only, not body diameters. Its job is to show you overall length so you know when trimming is needed, and to show how far your shoulder is being bumped during sizing. It's intended for use with fired and resized cases to set a baseline for full-length sizing.
Yes, this gage covers both .308 Winchester and 7.62 NATO since they share the same case dimensions. It's a great way to confirm your military surplus or commercial brass is sizing and trimming to the right spec.
If a fired case sits proud of the max headspace step, your rifle's chamber likely runs a little larger than average, which is useful to know. You can still use the gage to figure out exactly how much resizing is needed to bump the shoulder back just below your chamber's headspace. That keeps your brass from being overworked and gives you more consistent chambering.
| UPC | 857949005081 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CG-308W |
| Shipping Weight | 0.39 |
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