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The 338 Weatherby RPM is a big-bore magnum built around the six-lug Mark V action, and feeding it good brass is where real accuracy starts. Peterson Cartridge builds these cases to a match-grade standard they hold through every step of production, which means consistent case walls, primer pockets, and flash holes that translate to repeatable ignition and velocity on the target. This is unprimed rifle brass, so you'll be starting with a clean slate to work up your own loads.
Peterson runs a dedicated, modern case line and doesn't split its attention across bullets, powder, or loaded ammo. That single focus shows up in the finished product. The 338 WBY RPM is a non-belted, rebated-rim design with a 35-degree shoulder and low body taper, so case capacity is generous and the cases headspace off the shoulder rather than a belt. Reloaders tend to appreciate that, since it makes for cleaner sizing and better case life over multiple firings when you take care of them.
The cartridge was designed to push heavy-for-caliber 338 bullets, typically in the 185 to 225 grain range, with 225-grain loads running right around 2,800 fps from a 24-inch barrel at SAAMI's 65,000 psi ceiling. That gives you a serious big-game and long-range platform in a rifle that stays light. Starting with brass this uniform means less prep sorting and trimming, and more time spent dialing in your powder charge and seating depth.
This is the 250-count bulk pack, which is the way to go if you shoot this cartridge seriously or load for more than one rifle. Having a large lot of matched brass on hand lets you keep your batches consistent and your firings tracked, which is exactly what you want when you're chasing tight groups at distance. Made in the USA by a company that lives and breathes brass.
These are unprimed rifle cases, so you'll prime, charge, and seat your own bullets. That gives you full control over your load development from the ground up. It's new, first-fired-ready brass straight from Peterson's match-grade line.
The 338 WBY RPM was purpose-built for the Weatherby Mark V six-lug action. It's based on the 6.5 Weatherby RPM case necked up to accept a .338 caliber bullet, delivering magnum performance in a lighter, more compact rifle. Always load and shoot it in a firearm chambered and marked for this cartridge.
This is the 250-count bulk pack, part number 40067-P. It's a larger lot than the standard 50-count boxes, which makes it a good choice if you shoot this cartridge often or want a big batch of matched brass for consistent load development.
Factory loads for this cartridge run from 185 to 225 grains, with 225-grain bullets landing right around 2,800 fps from a 24-inch barrel. Heavy-for-caliber bullets in that range are the sweet spot for big game and long-range work. Check a current reloading manual for safe charge data before you start.
| UPC | 810068270983 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 40067-P |
| Length | 10" |
| Quantity | 250 CT |
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