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The L.E. Wilson Adjustable Case Gage for .338 Win Mag is built for reloaders who want tight control over their belted magnum brass. Belted cases like the .338 Win Mag headspace off the belt, which is great for safety but rough on case life if you over-work the shoulder every time you resize. This gage solves that problem by letting you measure a fired case from your own rifle and dial your sizing die to bump the shoulder back just enough and no more. The result is brass that lasts longer and chambers consistently.
The heart of this tool is a floating insert you set to your own fired cases. Drop a fired case in, take a reading on headspace with a depth micrometer or caliper, then slowly dial in your full-length sizer until you see roughly a .001 to .002 drop. That gives you a case sized just below your chamber's headspace, which means a cleaner chambering fit and less stretch where head separation likes to start. Because you can adjust it to match an individual rifle, a lot of folks keep one dedicated to each belted magnum in the safe.
This is a two-piece, cylinder-style gage machined from steel for the kind of repeatability you want out of a measuring tool. Beyond shoulder setback, it doubles as a quick case-length checker. Once your brass is sized, set it in the gage head-down on a flat surface and sight across the top to read minimum and maximum trim length. One tool handles the two measurements that matter most on magnum brass.
L.E. Wilson has been turning out precision reloading gear for decades, and this gage is made in the USA. For anyone loading .338 Win Mag seriously, it's a straightforward way to keep headspace honest and get more loadings out of every piece of brass.
It measures two key things on your brass: cone-to-head length, which tells you about headspace and shoulder setback, and overall case length for trimming. You take the headspace reading with a depth micrometer or caliper, then check trim length by sighting across the top of the gage. That covers the measurements that matter most when loading belted magnum cases.
Belted cartridges headspace off the belt, so if you resize the shoulder too aggressively every cycle, the case stretches and wears out fast. The floating insert lets you set the gage to your own fired cases, so you can bump the shoulder back just enough for reliable chambering without over-working the brass. That means longer case life and more consistent loads.
You can, but because the gage is set up off fired cases from a specific chamber, many reloaders prefer keeping one dedicated to each rifle. That way you never have to re-adjust it between setups. It's a common approach for folks running several belted magnums.
Yes. The gage gives you the reference surfaces, but you'll take your headspace reading with a depth micrometer or caliper depending on whether the case sits high or low in the gage. A standard set of calipers from your reloading bench will get the job done.
| UPC | 815145022059 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CGA-338WN |
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