The Peterson Cartridge .338 Weatherby RPM Rifle Brass (brand part no. 40067-P) gives precision handloaders a bulk supply of unprimed rifle cases purpose-built for the .338 Wby RPM cartridge. Peterson is known among competitive and long-range reloaders for tight case-to-case consistency, which translates directly into more uniform neck tension and better shot-to-shot accuracy at the bench. This 250-count bulk box is sized for handloaders running high volumes through a precision long-range or hunting rifle build who don’t want to reorder brass every few range sessions.

Key Specifications

• Chambered specifically for the .338 Weatherby RPM cartridge, so there’s no case-forming guesswork before you start loading.
• Packaged in a 250-count bulk box, giving high-volume reloaders enough brass for multiple load-development sessions without reordering.
• Built as dedicated rifle brass rather than a multi-caliber blank, keeping headspace and case dimensions consistent across the batch.

Frequently Asked Questions

Is this brass primed or does it need primers? It ships as reloading brass for handloaders to prime, charge, and seat bullets in per their own load data.

What cartridge is this brass for? It’s dedicated .338 Weatherby RPM brass — it isn’t a multi-caliber case that needs forming.

Buy the Peterson Cartridge .338 Weatherby RPM Rifle Brass

Browse more reloading supplies or order this one below. If you’re loading for a .338 Wby RPM rifle and want brass that holds its dimensions load after load, this bulk 250-count box from Peterson is built for exactly that. Order it from our Lubbock, Texas gun shop for fast, direct shipping to your door.