Peterson Cartridge 6.5-300 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 6.5-300 Wby Mag Brass Rifle Brass Casing: Manufacturer: Peterson Cartridge Gun Type: Rifle Caliber: 6.5-300 Weatherby Magnum Fabric/Material: Brass Package Contents: Peterson Cartridge 6.5-300 Wby Mag Brass Rifle Casing Peterson Cartridge 40059-P: 6.5-300 Wby Mag Brass Rifle Brass Casing Bulk 250 Count Box