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The L.E. Wilson Case Gage for 300 WSM is one of those tools that earns a permanent spot on the bench the first time you use it. It's a one-piece, non-adjustable gage machined to SAAMI chamber dimensions for the 300 Winchester Short Magnum. Drop a fired case in, run a caliper or depth micrometer across the top, and you've got a clear read on headspace and overall case length. No guesswork, no feelings involved. Just a hard reference that tells you where your brass stands.
The biggest payoff here is die setup. Reloaders tend to oversize their brass, bumping the shoulder back too far and shortening case life. With the Wilson gage, you take a reading on a fired case, then slowly dial in your full-length sizer until you see roughly .001 to .002 of shoulder bump. That little bit of setback keeps the case chambering smoothly in your rifle without working the brass any harder than it needs to be. Fewer case head separations, more reloads per piece of brass, and more consistent chamber fit downrange.
Once a case is sized, drop it back in and set the gage flat with the head down. Sight across the top and the machined step shows you the min and max trim window. If the case mouth is sticking proud of the high step, it's time to trim. This keeps your 300 WSM brass in spec for consistent crimp and neck tension, which matters a lot when you're chasing tight groups out of a bolt gun.
L.E. Wilson has been building these gages since 1935, and the design hasn't needed much changing. This one is precision-machined from steel with knurling in the middle for grip, and it's made in the USA. One thing worth knowing up front: it checks length and headspace, not case body diameter, so pair it with a body or min dimension gage if you need that measurement too.
It checks two things: headspace, measured from the case head to the datum line on the shoulder, and overall case length to tell you when trimming is due. It's meant to be used with fired cases so you can see how much your sizing die is setting the shoulder back. Note that it does not measure case body diameter, so if you need that reading you'll want a separate body gage.
No, this is the one-piece, non-adjustable style machined to SAAMI dimensions for the 300 WSM. Wilson's adjustable gages with the floating insert are made for belted magnum cases, which the 300 WSM is not. For a rimless case like the Short Mag, this fixed gage is exactly what you want.
Drop a fired case in the gage and take a headspace reading with a caliper or depth micrometer. Then slowly dial in your full-length sizer until you get about .001 to .002 of shoulder bump below that fired measurement. That gives you proper chamber fit while saving your brass from being overworked.
You can drop any 300 WSM case in it, factory-fired or reloaded, to check headspace and length. In practice it's most useful during case prep and die setup for reloading. It gives you a hard reference point rather than relying on feel when you resize and trim.
| UPC | 857949005623 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CG-30SM |
| Shipping Weight | 0.37 |
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