Product Overview

Peterson 300 Win Mag Casing – Box of 50 is purpose-built brass for shooters who care about consistency, case life and reliable performance. Each case is made from high quality cartridge brass, with a crisp, correctly located belt and carefully controlled grain structure in the case walls. The mouth and neck are annealed for smooth resizing, and the polished finish helps feeding and handling stay clean in the field or on the bench. These cases are supplied unprimed so you can choose your own primers and tune loads to your rifle. Designed for .300 Winchester Magnum rifles and tested at SAAMI max pressures, Peterson brass is built to handle repeated firings while maintaining tight dimensions. If you’re chasing dependable 300 Win Mag performance and want brass that holds up to serious use, this 50‑piece box is ready to slot straight into your reloading workflow.

Key Features

• Premium cartridge brass construction provides durable, reloadable cases that stand up to repeated firing cycles.
• Unprimed case design lets reloaders choose their preferred primers for tailored performance and consistent ignition.
• Annealed mouth and neck treatment supports smooth resizing and helps maintain neck tension for reliable accuracy.
• Polished case finish promotes clean handling and reliable feeding through your rifle’s action.
• Multiple quality inspections ensure consistent case dimensions for dependable chambering and ballistic performance.
• .300 Winchester Magnum compatibility makes these cases ideal for building precision hunting or long-range loads.
• Belted magnum case design is engineered for a crisp, correctly located belt to support safe, reliable operation.
• Supplied in a box of 50 cases, giving reloaders a convenient batch size for load development and practice.
• Designed to withstand repeated firings at SAAMI maximum pressure when properly resized, supporting long service life.
• Manufactured by Peterson, a specialist in high-quality reloading brass for serious shooters and reloaders.