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If you're loading 6mm ARC and want your sized brass to come out right every time, the L.E. Wilson Case Gage earns a permanent spot on the bench. It's a machined one-piece gage cut to match the 6mm ARC chamber, and it does two jobs that matter most to a precision reloader: checking overall case length so you know when it's time to trim, and checking the datum-to-head length so your shoulder ends up where it should be. Wilson has been building these tools since the 1930s, and the reputation for tight tolerances is well earned.
The real workhorse use here is setting up a full-length sizing die. Drop a fired case into the gage and you can read exactly how far your shoulder is being pushed back once you run it through the die. That feedback loop is how you stop bumping the shoulder too far, which is one of the most common ways reloaders shorten case life and flirt with case separation. Pair it with a caliper and you can put real numbers to your shoulder bump instead of guessing.
Think of this as a go/no-go reference for your brass in as-fired or sized condition. It flags when a case has grown past max length and needs trimming, and it shows whether your headspace is sitting inside spec. Worth knowing up front: this gage reads length and headspace at the datum, not body diameter, so it's a headspace and trim reference rather than a full case-dimension checker. It's meant to be used with fired cases to give you a baseline for how you set up full-length sizing and trimming.
For anyone running an AR-platform or bolt gun in 6mm ARC and chasing consistency, this is a simple, no-battery tool that pays for itself in brass life and peace of mind. Solid steel, made in the USA, and dead simple to use.
Drop a fired or sized case into the gage and compare the case head and shoulder against the gage surfaces. Using a caliper alongside it lets you measure exactly how far your shoulder is being bumped so you can fine-tune your full-length sizing die. It's also how you check whether a case has grown past max length and needs trimming.
No. This gage checks overall case length and the datum-to-head length for headspace. It is not designed to measure body diameters, so it's best thought of as a headspace and trim-length reference rather than a full case-dimension tool.
The biggest payoff is setting up your sizing die so you don't push the shoulder back too far. Oversizing is one of the most common reloading mistakes and it shortens case life and can lead to case separation. The gage gives you a clear, repeatable baseline so your brass lasts longer and your loads stay consistent.
The gage works on its own as a quick visual reference, but pairing it with a caliper is where it really shines. The caliper lets you put actual numbers to your headspace and case length, which makes dialing in your sizing die and trim length much more precise.
| UPC | 815145027344 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CG-ARC |
| Shipping Weight | 0.3 |
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