Peterson Cartridge Unprimed Rifle Brass Features The Peterson Cartridge Unprimed Rifle Brass for .300 WSM is manufactured to match grade standards throughout the production process from small batch manufacturing lines through final quality control inspection. The mouth and neck of each case are annealed a process that relieves stress in the brass and helps maintain consistent neck tension over repeated firings and reloadings. This consistency is critical for handloaders chasing tight group sizes since inconsistent neck tension can introduce unwanted variation in bullet seating and release. Each case is beautifully polished giving handloaders a clean uniform product right out of the box. This brass is sold unprimed meaning it requires a large rifle primer and propellant to be loaded into finished ready to fire ammunition. It is intended strictly as a reloading component not a loaded cartridge and is built for reloaders who want consistent high quality brass as the foundation of their .300 WSM handloads. Made in the United States of America Peterson Cartridge brass undergoes multiple quality inspections to ensure every case meets the company s match grade standard. For handloaders who demand consistency from their brass through every stage of the reloading process Peterson s .300 WSM brass is built to deliver that standard from the bench to the target. Peterson Cartridge Unprimed Rifle Brass Specifications Manufacturer: Peterson Cartridge Caliber: .300 WSM Material: Brass Firearm Type: Rifle Primer Size: Large Rifle Reloadable: Yes Rounds Per Box: 50 Available At: GrabAGun