All of Peterson’s Cases are made from premium materials and is precisely machined for quality. The cases begin as a long coil of top-quality C260 brass, which is then cut into “cups”. These cups are then put through a draw-press three times to elongate them into tubes, before being trimmed-to-length and washed for the forming process. The rear of the tube is then given a “pocket” for the primer and the extraction groove is cut. After that, the “mouth” of the case is tapered to form the “neck”, and the case is trimmed-to-length again. The flash hole is punched in the primer-pocket, and the mouth and neck are given an induction anneal to properly grab the projectile. The cases are washed again, and are finally ready to be loaded. Peterson Brass Peterson .338 Weatherby RPM Brass Casings Box of 50rds 40067R