Peterson Cartridge Unprimed 6mm Creedmoor SRP Rifle Brass 50 Piece PETERSON. Match-Grade is a standard that must be held throughout the entire process of manufacturing some of the most consistent accurate and durable brass rifle casings available today. From Peterson Cartridge small batch production lines to their quality control department to your bench and on to the range. Match-grade is the standard that Peterson Cartridge strives to achieve so that the customers can maintain that standard all the way to the target. Note: All Peterson Cartridge SRP casings feature a small flash hole in the diameter of 0.060 in vs. the 0.080 in flash hole found in the LRP casings. This means you will need an X-small/ Undersized Decapping Pin to deprime our casings. Specifications for Peterson Cartridge Unprimed 6mm Creedmoor SRP Rifle Brass: Manufacturer: Peterson Cartridge Gun Type: Rifle Caliber: 6mm Creedmoor Fabric/Material: Brass Country of Origin: USA Package Contents: Peterson Cartridge 6mm Creedmoor SRP Rifle Brass Peterson Cartridge PETERSON: Unprimed 6mm Creedmoor SRP Rifle Brass 50 Piece