Peterson Cartridge 6mm GT Brass Rifle Brass Casing Bulk 500 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 6mm GT Brass Rifle Brass Casing: Manufacturer: Peterson Cartridge Gun Type: Rifle Caliber: 6mm GT Fabric/Material: Brass Package Contents: Peterson Cartridge 6mm GT Brass Rifle Casing Peterson Cartridge 40076-P: 6mm GT Brass Rifle Brass Casing Bulk 500 Count Box