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If you're loading for the 338 Weatherby RPM, starting with the right brass makes everything downstream easier. This is Weatherby's own Select Plus unprimed rifle brass, cut and formed for the 338 WBY RPM cartridge so you're not fighting dimensions or neck tension right out of the gate. It comes unprimed and ready for your prep routine, whether that's a quick chamfer and deburr or a full pass through your dies.
The 338 WBY RPM is a different animal from the classic belted Weatherby rounds. The RPM case skips the belt and the double-radius venturi shoulder, running a non-belted design with a rebated rim and a 35 degree shoulder. The rim shares the same .473 diameter as the 30-06 family, so it feeds through a standard bolt face while the fatter magnum body packs in the powder capacity that gives this round its speed. Weatherby built it to run in the compact six-lug Mark V action, which is how you get magnum punch out of a lightweight backcountry rifle.
Using brass made by the same company that developed the cartridge takes a lot of guesswork off the table. The cases are formed to spec with consistent wall thickness and web dimensions, which helps your charges behave predictably and your groups tighten up. For a modern round like the 338 RPM where published load data is still growing, starting with known-good brass is one less variable to chase.
The RPM runs at a 65,000 psi maximum pressure, and factory loads push 185 to 225 grain bullets around 2,800 to 3,100 fps depending on barrel length. That makes bullet choice and powder selection the fun part, since this case responds well to a range of magnum propellants. Do your usual full-length or neck sizing, trim to length, and work your loads up carefully from published starting data. Treated right, quality Weatherby brass will give you multiple reloading cycles before it's ready to retire.
It ships unprimed, so you'll seat your own primers as part of your load prep. The 338 WBY RPM uses a Large Rifle Magnum primer. Unprimed brass gives you full control over your component choices and load workup.
The RPM case drops the belt and the double-radius venturi shoulder that older Weatherby rounds are known for. Instead it runs a non-belted design with a rebated rim and a 35 degree shoulder. The rim matches the 30-06 diameter, which lets the cartridge work in a standard bolt face while the magnum-sized body still carries plenty of powder.
Yes, this is Weatherby Select Plus brass made specifically for the 338 WBY RPM cartridge, which Weatherby designed around its six-lug Mark V action. As always, confirm your chamber and run the cases through your normal sizing and trimming routine before loading.
Quality brass like this is built to handle multiple reloading cycles when you care for it properly. Case life depends on your pressures, sizing method, and how well you anneal and trim. Watch for signs of wear such as loose primer pockets or neck splits and retire cases when they show up.
| UPC | 747115450817 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BRASS338 |
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