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Belted magnums like the 300 Win Mag headspace off the belt, which is great for safety but tough on brass if you keep shoving the shoulder back further than it needs to go. That's exactly the problem this L.E. Wilson Adjustable Case Gage was built to solve. Instead of a fixed gage, it uses a floating insert you can set to your own fired brass, so you're measuring and sizing to your specific rifle's chamber rather than a generic spec. The result is less overworked brass, longer case life, and reloads that chamber the same way shot after shot.
Setup is straightforward. You drop an as-fired, de-capped case into the gage and push the insert until the head sits even with the gage surfaces, then snug down the small set screws. From there the gage is tuned to your chamber. Measure a fired case, resize, then drop it back in to see exactly how far you moved the shoulder. Pair it with a caliper or depth micrometer and you can creep your full-length die in until you get just a thousandth or two of setback, which is the sweet spot for accuracy and brass life.
This tool does double duty. Stand a resized case head-down in the gage on a flat surface and look across the top. If the case mouth pokes above the upper surface, it's too long and it's time to trim. The overall length of the gage body represents maximum case length, so you've got a quick, no-guesswork trim check right alongside your headspace reading.
L.E. Wilson has been machining reloading tools in the USA since 1927 and invented the original cartridge case gage back in 1935, so there's some real pedigree here. Reloaders who run belted magnums tend to buy one per rifle so they never have to reset the insert. One note worth knowing: this gage checks length and shoulder datum, not case body diameters.
The standard gage is a fixed, one-piece tool, while this one has a floating insert you set to your own fired brass. That adjustability lets you tune it to a specific rifle's chamber, which matters on belted magnums where headspace comes off the belt instead of the shoulder. It gives you control over how much you set the shoulder back so you don't overwork the brass.
The 300 Win Mag is a belted magnum, and the belt handles headspace rather than the shoulder. The trade-off is that sizing the shoulder back too far shortens case life fast. This gage lets you measure a fired case and dial your die in so you only bump the shoulder a thousandth or two, which keeps your brass alive longer.
You can read trim length by eye, standing a case head-down in the gage and checking if the mouth clears the top surface. For headspace and shoulder setback, a caliper or depth micrometer gives you precise numbers to work from. Most reloaders chasing consistency use one alongside the gage.
No, this gage measures case length, shoulder datum, and headspace. It does not check body diameters. If you need to verify body dimensions you'll want a separate tool for that job.
| UPC | 815145022035 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CGA-300WN |
| Shipping Weight | 0.45 |
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