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The L.E. Wilson 7x57mm Mauser Case Gage is one of those simple tools that quietly makes your reloading bench a lot more precise. It's a one-piece, non-adjustable steel cylinder machined to SAAMI minimum chamber dimensions for the 7×57, and it does two jobs really well: it shows you how your case headspace stacks up and it tells you when your brass needs a trim. For a classic like the 7mm Mauser, where chambers can vary from one old military action to the next, that kind of quick feedback is worth its weight in gold.
The idea is dead simple. You drop a case into the gage and read it with a caliper or depth micrometer. The gage lets you see exactly how much you're pushing the shoulder back when you full-length size, which is the key to not overworking your brass and shortening its life. Measuring an as-fired case first, then a resized one, gives you a clear before-and-after so you can dial your sizing die in just right. This is the same tool concept Sam Wilson came up with back in 1935 to help a fellow shooter beat case separation, and it still solves that problem today.
Flip the brass head-side down and set the gage on a flat surface, then sight across the top to see where your case mouth falls against the min and max trim marks. The 7×57 trims to around 2.225 inches with a max case length near 2.235, and this gage makes it easy to catch cases that have stretched past spec after firing and sizing. One thing worth noting: it checks headspace and overall length, but it does not measure body diameters.
Made in the USA from precision-machined steel, this is a buy-it-once tool that belongs in the kit of anyone loading for the 7×57. Whether you're feeding a vintage Mauser or a modern sporter, it takes the guesswork out of setting up your dies.
It measures both headspace (the datum-to-head dimension) and overall case length against SAAMI minimum chamber specs for the 7×57. Drop a case in and read it with a caliper or depth micrometer to see where your brass sits. It does not measure body diameters, so it's focused on shoulder position and trim length.
Measure a fired case in the gage first, then resize and measure again to see how far you pushed the shoulder back. Slowly dial in your full-length sizer until you get about a .001 to .002 inch drop in headspace, which gives you proper fit without overworking the brass. That little bit of feedback is what keeps your cases alive longer and your reloads consistent.
Yes. The gage is cut to SAAMI minimum dimensions, so it gives you a reliable reference point no matter what rifle you're loading for. Since chambers vary quite a bit between vintage Mauser actions and newer sporters, having this gage is especially handy for the 7×57.
No, this is the one-piece, non-adjustable style made specifically for the 7x57mm Mauser. L.E. Wilson makes a separate adjustable gage intended for belted magnum cases, but this fixed gage is the standard tool for a rimless cartridge like the 7mm Mauser.
| UPC | 857949005920 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CG-7MAS |
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