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The 7mm STW has always been a reloader's cartridge. Factory ammo is tough to come by, so if you own one of these flat-shooting speed demons, good brass is the heart of the whole operation. Peterson Cartridge builds this 7mm STW brass to their Match-Grade standard, running small production batches through dedicated in-house quality control so each case comes out of the box with uniform wall thickness, consistent internal volume, and precisely formed primer pockets and flash holes.
The 7mm STW is a belted bottleneck cartridge that started life as a wildcat when Layne Simpson necked the 8mm Remington Magnum down to .284. It earned SAAMI certification in 1996 and has a loyal following among hunters chasing elk, mule deer, and other western big game at distance. With a case capacity north of 90 grains of water and a max pressure of 65,000 psi, it drives heavy-for-caliber 7mm bullets fast and flat, which is exactly why you want brass that can take repeated warm loads without giving up primer pockets early.
Each box holds 50 unprimed cases. Shipping them unprimed puts primer selection in your hands, which matters on a cartridge like the STW that runs large rifle magnum primers. The brass arrives ready to prep, with centered flash holes and consistent dimensions that let a lot of handloaders skip heavy sorting. Keep in mind the STW is a belted case, so like most belted magnums it tends to stretch on that first firing. Many precision loaders resize to headspace off the shoulder after fire-forming to keep case life long and brass trimming to a minimum.
Peterson dedicates its entire operation to brass alone, and it shows in the consistency. Reloaders who run their belted magnum lines regularly report uniform case weights and primer pockets that hold tight through multiple firings. For a cartridge where quality factory ammo is scarce, having a dependable, repeatable brass source makes load development far less of a headache and keeps your groups honest downrange.
No, it ships unprimed. That lets you pick and seat your own primers, which is handy on the 7mm STW since it runs large rifle magnum primers. You'll want to prep the brass and prime it before building your loads.
Yes, the 7mm STW is a belted bottleneck case derived from the 8mm Remington Magnum. Like most belted magnums, it tends to stretch noticeably on the first firing. Many handloaders fire-form first, then resize to headspace off the shoulder to stretch out case life and reduce trimming.
This is the standard 7mm STW, part number 40082-R. Peterson also offers a separate STW Long case under a different part number, so double-check which one your chamber and reloading data call for before ordering.
Case life depends on your load pressure, sizing practices, and how hot you run it, so no one can promise an exact number. That said, Peterson is known for tight primer pockets and durable brass that holds up well through repeated reloads when loaded sensibly and cared for properly.
| UPC | 810068271447 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 40082-R |
| Quantity | 50 |
| Shipping Weight | 2.45 |
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