Petersen's Hunting The Weatherby .338 RPM The legacy company releases their 16th cartridge in 77 years of business Photo Courtesy of Weatherby August 04, 2022 By The Editors Built using the popular 6.5 Weatherby RPM as its parent case, the new .338 WBY. RPM. RPM combines the traditional, fire-breathing power of Weatherby components with modern ballistic technologies. The new magnum cartridge sends a heavy-for-caliber bullet at more than 2,800 fps for maximum terminal performance on big and dangerous game.Weatherby is known for ballistic superiority, touting many of...Continue Reading Don't Miss The Essentials Gear Box. Our editors have hand-picked these essential pieces of gear to make you a more successful hunter when you hit the game trails this season. Learn More