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If you're loading for the 300 Norma Magnum, you already know this cartridge rewards attention to detail, and the L.E. Wilson 300 Norma Mag Case Gage is one of the simplest ways to keep your brass in check. It's a single piece of machined steel with no moving parts to adjust or lose. You drop a case in, look it over, and the milled reference surfaces tell you whether your brass falls inside the minimum and maximum window for both headspace and overall case length. That's the whole job, and it does it well every single time.
The real value here shows up when you're setting up a full-length sizing die. Oversizing is one of the most common mistakes in reloading, and it quietly works your brass to death and can cause case separation down the road. By comparing a fired case against this gage, then checking a resized one, you can see how far you're actually pushing the shoulder back and dial your die in so you're only bumping it the amount you need. The same gage shows you when your cases have stretched past trim length, so one tool covers two of your most important measurements.
Using it is about as straightforward as reloading gets. Set a case in the gage, rest it on a flat surface head-down, and look across the milled step at the top to judge trim length. For a precise headspace number, pair it with a caliper or a Wilson depth micrometer and you'll get repeatable readings you can trust. Worth noting, it checks length and headspace only, not body diameter.
L.E. Wilson invented the cartridge case gage back in 1935, and the design has stayed popular for the better part of a century because it just works. This one is machined right here in the USA to the same standard reloaders have leaned on for generations. Whether you're building long-range match ammo or just want your Norma brass to last more firings, it's one of those quiet bench tools you'll reach for every loading session.
It checks two things: headspace (the datum-to-head dimension) and overall case length, each against a minimum and maximum reference. Drop a fired or resized case in and the milled surfaces show whether you're inside spec. Keep in mind it does not measure body diameter.
No, the .300 Norma Magnum is a rimless cartridge, so this is Wilson's standard one-piece, non-adjustable gage. The adjustable style is made specifically for belted magnum cases. For Norma brass, this fixed one-piece design is exactly what you want.
You can eyeball trim length by looking across the step at the top of the gage with the case seated. For an exact headspace reading, pair it with a caliper or a Wilson case gage depth micrometer. That combo lets you dial your full-length sizing die in precisely.
A case gage shows you how far your die is actually bumping the shoulder back, which helps you avoid oversizing. Oversizing overworks brass and can lead to case separation over time. Setting your die to the gage keeps your Norma brass alive for more firings and keeps your loads consistent.
| UPC | 815145027269 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CG-300NM |
| Shipping Weight | 0.42 |
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