PETERSON CARTRIDGE 300 WINCHESTER MAGNUM LONG BRASS The Peterson Cartridge 300 Winchester Magnum Long Brass delivers unmatched consistency, durability, and accuracy for reloaders who demand top-tier performance. Engineered with Peterson's renowned manufacturing standards, this long-length brass is optimized for precision rifle builds, long-range competition, and high-pressure hunting loads. FEATURES Match-grade consistency with extremely tight dimensional tolerances Long-length brass design for custom trimming and precision chamber fit Heat-treated construction for superior strength and extended case life Uniform neck wall thic Mfg: Peterson Cartridge