Petersen's Hunting Weatherby .338 RPM: First Look The legacy company releases their 16th cartridge in 77 years of business, introducing the .338 RPM. Photo Courtesy of Weatherby August 04, 2022 By Petersen's Hunting Staff 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 the fastest cartridges available by caliber, as well as the strongest rifle action available with the Mark V Magnum 9-lug action. Like the 6.5 WBY. RPM, the new .338 RPM has been...Continue Reading