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Belted magnums like the 7mm Rem. Mag. come with their own set of reloading quirks, and the L.E. Wilson Adjustable Case Gage was built to handle them. Factory belted ammo headspaces off the belt, but once you start reloading you really want to be managing the shoulder instead. Push that shoulder back too far every cycle and your brass stretches, thins, and eventually separates. This gage gives you a way to see exactly how much you're moving the shoulder so you can back off and keep cases in service longer.
The key feature here is the floating insert. You set a fired case into the gage, lock the insert to that reference using the set screws and the included 3/32 hex wrench, and from that point the gage is tuned to your specific chamber. That turns a general-purpose gage into one matched to your rifle, letting you control the amount of resizing simply by measuring a fired case. It's a two-piece, cylinder-style tool machined from steel right here in the U.S.A.
Beyond headspace, this gage checks minimum and maximum overall case length so you know when it's time to trim. Drop a sized case in, set the gage on a flat surface head-side down, and look across the top. The stepped surfaces show you where your case falls between the min and max marks. A straight edge, depth micrometer, or set of calipers makes the readings even more precise when you're fine-tuning a sizing die.
L.E. Wilson has been machining precision reloading gear for the better part of a century, and their case gages are something of a benchmark on the loading bench. Reloaders who run belted magnums tend to appreciate how simple the process becomes: measure fired brass, adjust the die, confirm the result, and move on knowing your rounds will chamber and your brass will last. It's a straightforward piece of equipment that earns its spot in a 7mm Rem. Mag. loading setup.
The floating insert is what makes this gage adjustable to your specific rifle. You set a fired case in the gage, position the insert to that reference, and lock it with the set screws and the included hex wrench. From there the gage reads shoulder setback based on your own chamber rather than a generic spec.
Belted magnums like the 7mm Rem. Mag. headspace on the belt from the factory, but reloaders are better off managing the shoulder to extend brass life. Because every chamber is a little different, the adjustable design lets you tune the gage to your rifle. That helps you avoid pushing the shoulder back too far and overworking your cases.
Yes. Along with headspace, it checks minimum and maximum overall case length. Set a sized case in the gage on a flat surface, head-side down, then look across the stepped surfaces on top or run a straight edge over them to see if the case needs trimming.
You can get a basic pass or fail reading by eye or with a straight edge across the top of the gage. For dialing in a sizing die precisely, a depth micrometer or calipers gives you actual measurements to work with. Many reloaders use both methods together.
| UPC | 815145022110 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CGA-7RMM |
| Shipping Weight | 0.44 |
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