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If you're running a 6mm Dasher and reloading your own brass, the L.E. Wilson Case Gage is one of those small bench tools that quietly saves you a lot of grief. It's a one-piece gage machined to drop a fired or sized case right in, letting you read both the overall length and the shoulder datum so you know exactly where your brass sits before you ever touch a sizing die.
L.E. Wilson has been building these gages since 1935, and they've been a family-run outfit since 1927. The whole idea behind the original design was solving case-separation problems, and that's still the core job here. The most useful trick is simple: measure a case in as-fired condition, size it, then measure again. That before-and-after tells you precisely how far you're pushing the shoulder back, which is the difference between brass that lasts a dozen firings and brass that's cracked at the web after three.
The Dasher is a shoulder-bump cartridge by nature, and that's exactly where this gage shines. Pair it with a caliper or the Wilson depth micrometer and you can dial your full-length die to bump the shoulder just a couple thousandths, which is what you want for a snug chamber fit without beating up your cases. It also flags when your brass has grown past max length and needs a trim. Worth noting, this gage checks length and headspace, not body diameter.
These are machined from steel with the familiar polished finish and a knurled band around the middle for grip. The gage runs right around 2.49 inches long and weighs in near four ounces, so it stores easily in a drawer or ammo box. It's made in the USA and cut specifically for the 6mm Dasher, so there's no fiddling with inserts or adapters.
For precision guys chasing consistent groups off a bolt gun, this is the kind of tool you set up once and reach for every loading session. It takes the guesswork out of sizing and keeps your Dasher brass shooting straight.
Drop a fired case into the gage and measure the shoulder datum to head with a caliper or the Wilson depth micrometer. Then size the case and measure again to see how far you pushed the shoulder back. Adjust your full-length die until you're bumping the shoulder only a couple thousandths for a proper chamber fit.
No, this gage is designed to check overall case length and headspace datum only. It does not measure body diameters or detect case bulge. For that you'd need a separate tool, but for setting shoulder bump and catching cases that need trimming, this covers the important bases.
This gage is intended to be used with fired cases to establish a baseline for full-length sizing and trimming. Measuring in the as-fired condition tells you what your chamber is actually doing, which is the whole point. From there you size and re-check to confirm your die setup.
This is the regular one-piece style, which is correct for the rimless 6mm Dasher. The adjustable version with a floating insert is made for belted magnum cases, so you don't need it here. The fixed one-piece gage is the right call for the Dasher.
| UPC | 857949005821 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CG-6DAS |
| Shipping Weight | 0.31 |
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