Description
The Peterson 338 Weatherby RPM Brass, item 40067-P, is a bulk pack of 250 rifle cases from Peterson Cartridge for reloaders building their own 338 Weatherby RPM ammunition. This is empty brass, not loaded ammunition.
Peterson 338 Weatherby RPM Brass Overview
Peterson Cartridge makes match-grade rifle brass in Pennsylvania, and its cases have earned a strong following among long-range shooters and hunters who load their own ammunition. Peterson focuses on consistent wall thickness, case weight and neck tension, which helps produce uniform velocities and tight groups. The 338 Weatherby RPM is a modern, efficient magnum, and quality brass for it can be hard to find, which makes this bulk pack a good way to stock up.
About the 338 Weatherby RPM
Weatherby introduced the 338 RPM, short for Rebated Precision Magnum, as a magnum-level 338 cartridge that fits a standard-length action. It drives heavy 338 bullets fast enough for elk, moose and other large game while allowing lighter, more compact rifles than a belted magnum would need. The rebated rim and lack of a belt also help with headspacing on the shoulder.
Why Brass Quality Matters
Uniform cases give uniform results. When case weight, internal volume and neck thickness stay consistent from case to case, velocities stay consistent too, which tightens vertical spread at long range. Strong, well-annealed brass also lasts longer, so you get more firings from each case before it needs to be replaced.
Reloading Notes
Always use published load data from a reputable source for the 338 Weatherby RPM and work up from the starting charge. Check each case before loading, and size, trim and chamfer as needed for your dies and chamber. Peterson brass is sold for handloaders who are experienced with these steps.
Compatibility
These cases are for 338 Weatherby RPM rifles only, such as Weatherby Mark V and Vanguard rifles chambered for the cartridge. They are not interchangeable with 338 Winchester Magnum, 338 Lapua Magnum or other 338 cartridges.
Made in Pennsylvania
Peterson Cartridge manufactures its brass in Pennsylvania, not far from our shop. Buying American-made brass supports domestic manufacturing and gives you a dependable supply of components for your rifles.
Preparing New Brass
New brass usually benefits from a little preparation before the first firing. Run each case through a sizing die or a mandrel to true up the necks, lightly chamfer and deburr the case mouths, and check overall length against your load data. Sorting cases by weight can further reduce velocity spread for long-range work. Once fired in your chamber, the brass will be fire-formed to your rifle, which often improves accuracy with later loadings.
Getting the Most From Your Brass
Track how many times each batch has been fired, anneal necks as needed, and keep cases sorted by lot. Many handloaders weigh and sort new brass before the first loading for the most consistent results at long range.
Storage and Care
Store brass in a cool, dry place in its original boxes or sealed containers, away from ammonia-based cleaners and moisture that can cause corrosion or weaken the brass over time.
Specifications
- Brand: Peterson Cartridge
- Item number: 40067-P
- Cartridge: 338 Weatherby RPM
- Product: Empty rifle brass (cases)
- Count: 250 cases
- Made in the USA
- UPC: 810068270983
Before You Buy
This is a reloading component, not loaded ammunition. Some states and cities restrict shipping of ammunition components, so check your local rules before you order.
Who It Is For
The Peterson 338 Weatherby RPM Brass is a great fit for handloaders and long-range hunters who shoot a 338 Weatherby RPM and want consistent, American-made cases.
Buy the Peterson 338 Weatherby RPM Brass at MAG5 Firearms
MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the Peterson 338 Weatherby RPM Brass online and we will ship it to you where state and local law allow, or browse our full selection of ammunition and components for more reloading supplies. For factory details, visit Peterson Cartridge.
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