Peterson Cartridge .300 WSM Rifle Brass, 50-Count

The Peterson Cartridge .300 WSM Rifle Brass (brand part no. 40079-R) is a 50-count box of unprimed rifle cases built for the .300 Winchester Short Magnum, a proven big-game and long-range cartridge that delivers magnum ballistics out of a short-action platform. Peterson’s cases are held to tight dimensional tolerances, which keeps case capacity and neck tension consistent across the batch — a real advantage when you’re chasing a repeatable magnum load. This quantity is well suited to load development before stepping up to a bulk order.

Key Specifications

• Formed specifically for the .300 WSM cartridge, matching the short-magnum case geometry.
• Sold in a 50-count box, a practical amount for proving a load before a larger bulk purchase.
• Manufactured as dedicated rifle brass for consistent case capacity and wall thickness load to load.

Frequently Asked Questions

What cartridge is this brass built for? It’s dimensioned specifically for the .300 Winchester Short Magnum.

How many cases are in a box? This is a 50-count box.

Buy the Peterson Cartridge .300 WSM Rifle Brass

Browse more reloading supplies or order this one below. A consistent magnum load starts with consistent brass, and this .300 WSM brass from Peterson is built to deliver that from the first case to the last. Order it from our Lubbock, Texas gun shop for fast, direct shipping to your door.