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The 338 Weatherby RPM is a big-bore backcountry round built to squeeze magnum performance out of Weatherby's lightweight Mark V 6-lug action, and brass this precise is what lets you get the most out of it. Peterson's take on this cartridge is drawn to exacting tolerances so you can seat a bullet and expect match-grade results without a full afternoon of prep. For a rifle designed to reach out and hit hard on elk, moose, and bear, having consistent brass under the bullet makes a real difference downrange.
Everything about these cases points at consistency. The walls are held to minimal thickness variation, the internal volume stays uniform lot to lot, and the necks come true and concentric right out of the plastic box. Peterson runs every case through the same die stacks within a lot, so neck tension lands in a tight window and stays that way across the whole batch. That kind of uniformity translates to lower velocity spreads and less vertical stringing when you stretch things out to distance.
Because the necks are already true and the tension is set from the factory, most handloaders skip the heavy virgin-brass prep and jump straight to loading. The cases are annealed during manufacturing for even neck tension and longer life, and the mirror finish you see is the result of extensive polishing. A light chamfer and deburr, a quick check, and you're ready to build your ladder. With this cartridge running around 81 grains of case capacity and pushing 225-grain bullets near 2,800 fps from a 24-inch barrel, quality brass keeps your loads safe and predictable.
Peterson has earned a reputation among long-range hunters and competitors for treating brass as a primary source of accuracy rather than a throwaway component. If you've invested in a rifle chambered for the 338 RPM, this is the brass that lets it live up to its potential shot after shot, firing after firing.
Very little. Peterson runs every case in a lot through the same tooling, so neck tension and dimensions are uniform straight from the box, and the necks come true and concentric. Most handloaders just chamfer, deburr, and give the flash holes a quick check before seating bullets. Heavy virgin-brass prep like sizing and neck turning usually isn't necessary.
Yes. Peterson anneals the cases during manufacturing, which promotes uniform neck tension and helps the brass last through multiple firings with proper care. You'll notice the finish and consistency reflect that process. Down the road you can re-anneal as part of your normal reloading routine to keep things running strong.
It's a big-bore hunting cartridge built around Weatherby's lightweight Mark V 6-lug action, delivering magnum-class energy in a rifle that carries easy in the backcountry. It's well suited for elk, moose, and bear, and typically pushes 225-grain bullets right around 2,800 fps from a 24-inch barrel. Handloaders like it for the flat trajectory and heavy-hitting terminal performance in a manageable package.
Peterson brass is known for durability and long case life, and many reloaders report double-digit reload counts with proper care. Case life always depends on your load pressure, sizing habits, and how often you anneal. Keeping your loads sensible and working the brass as little as possible will stretch its lifespan considerably.
| UPC | 810068270204 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 40067-R |
| Shipping Weight | 2.15 |
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