Peterson Cartridge Unprimed Rifle Brass Features The Peterson Cartridge Unprimed Rifle Brass for 7mm WBY Mag is manufactured to the company s match-grade standard a process Peterson states is upheld from small batch production lines through dedicated quality control inspection. Built entirely from brass the cases are sized for large rifle primers giving reloaders a reliable foundation for building magnum-level loads. Sold unprimed this brass gives handloaders full control over primer selection and seating depth right from the first firing. Consistent case weight and dimensions across the batch help produce more uniform pressures and velocities compared to mixed-brand range brass. Each box contains 50 cases a practical quantity for reloaders working up loads or running a dedicated load development session on the bench. Peterson s reputation for match-grade consistency is built specifically for shooters who want to maintain accuracy all the way from the reloading room to the target. The 7mm WBY Mag cartridge demands brass capable of handling high pressures reliably and this case is built with that requirement in mind. For Weatherby magnum shooters who reload their own ammunition this Peterson brass offers a trusted consistent starting point for every load. Peterson Cartridge Unprimed Rifle Brass Specifications Manufacturer: Peterson Cartridge Model: Unprimed Rifle Brass Caliber: 7mm WBY Mag Material: Brass Primer Size: Large Rifle Rounds Per Box: 50 Available At: GrabAGun