Weatherby BRASS257 Unprimed Brass Cases 257 Weatherby Magnum 20/Box

The Weatherby BRASS257 delivers the precise dimensions and consistent wall thickness that 257 Weatherby Magnum shooters demand for maximum accuracy and case longevity. These unprimed brass cases provide the foundation for handloaders seeking to extract peak performance from this powerful magnum cartridge.

What Makes This Different

Weatherby brass undergoes multi-stage quality control processes that ensure uniform case capacity and concentricity within 0.002 inches. The brass alloy composition balances strength for multiple reloading cycles against the flexibility needed to prevent case head separation under the intense pressures generated by 257 Weatherby Magnum loads. Factory annealing creates optimal neck tension for consistent bullet seating depth and release.

Key Features

• Premium brass construction rated for 8-10 reloading cycles with proper sizing
• Uniform wall thickness maintains consistent internal capacity within 0.5 grains
• Factory-annealed necks provide optimal bullet grip and release characteristics
• Precise flash hole diameter ensures consistent primer ignition
• Weatherby headstamp authenticates cases for magnum cartridge applications
• 20-count packaging reduces waste for typical load development sessions
• Compatible with standard 257 Weatherby Magnum chamber specifications

These cases handle the 257 Weatherby Magnum's operating pressures of 65,000 PSI while maintaining dimensional stability through multiple firing and sizing cycles. The brass composition resists work hardening during high-pressure applications, making them suitable for both hunting loads pushing 100-grain bullets at 3,600 fps and precision shooting applications. Proper annealing intervals extend case life significantly compared to standard brass offerings.

Technical Specs

• Caliber: 257 Weatherby Magnum
• Case length: 2.545 inches
• Rim diameter: 0.530 inches
• Base diameter: 0.511 inches
• Material: 70/30 brass alloy
• Quantity: 20 pieces per box
• Primer pocket: Large rifle
• Flash hole: 0.080 inches
• Country of origin: United States

Weatherby's reputation for magnum cartridge development translates directly into brass quality that withstands the demanding pressures these cartridges generate. Handloaders working with premium bullets and powders will find these cases provide the consistency needed for sub-MOA accuracy potential.