Peterson Cartridge 7mm Wby Mag Brass Rifle Brass Casing Bulk 250 Count Box. From small batch production lines to quality control department to your bench and on to the range. Match-grade is the standard that we strive to achieve so that our customers can maintain that standard all the way to the target. Specifications for Peterson Cartridge 7mm Wby Mag Brass Rifle Brass Casing: Manufacturer: Peterson Cartridge Gun Type: Rifle Caliber: 7mm Weatherby Magnum Fabric/Material: Brass Package Contents: Peterson Cartridge 7mm Wby Mag Brass Rifle Casing Peterson Cartridge 40065-P: 7mm Wby Mag Brass Rifle Brass Casing Bulk 250 Count Box