Peterson Cartridge is a family-owned Pittsburgh-area manufacturer of American-made, match-grade brass rifle casings built specifically for long-distance shooters. Founded by Derek Peterson and two partners after a search for hard-to-find hunting ammunition, the company now makes brass in more than 70 calibers and inspects every casing before it leaves the factory. Its small-batch approach and detailed dimensional and ballistic testing are aimed at giving reloaders consistent performance shot after shot.