Product Overview

Built for shooters who demand match-grade performance, the Peterson 300 Win Mag Casing LONG delivers rock-solid consistency from the loading bench to the firing line. Made in small batches and held to tight tolerances, this unprimed brass gives you uniform case capacity, reliable neck tension and a tough, well-formed belt – all the foundations you need for repeatable accuracy and long case life. Each box includes 50 .300 Winchester Magnum long cases, purpose-built for serious rifle work – whether you’re stretching things out at the range or fine-tuning a hunting load. Peterson’s focus on grain structure and wall thickness means these cases stand up to high-pressure loads and multiple firings, helping you spend more time shooting and less time culling brass. If you’re chasing tight groups and dependable performance, this is brass you can trust to do the job, shot after shot.

Key Features

• Match-grade brass construction delivers highly consistent case dimensions for repeatable accuracy shot after shot.
• Small batch production and rigorous quality control help minimise defects, giving shooters reliable performance at the bench and on the range.
• .300 Winchester Magnum long unprimed cases are optimised for precision rifle loads, supporting high-performance long-range shooting.
• Durable brass casing design withstands repeated firings, helping extend case life and reduce replacement frequency.
• Belted magnum case design is engineered for a crisp, correctly located belt to ensure proper headspacing and safe operation.
• Unprimed brass configuration lets reloaders customise primers and powder charges to match their specific rifle and shooting conditions.
• Carefully controlled grain structure in the case walls promotes uniform expansion and reliable resizing during the reloading process.
• Box of 50 casings provides a convenient quantity for load development, practice, or competition preparation.
• Manufactured to perform at SAAMI maximum pressure with minimal shoulder resizing, supporting demanding precision shooting applications.
• Peterson Cartridge branding signifies premium brass made for shooters who demand consistency from the loading bench to the target.