In 2016, Weatherby reviewed existing calibers and determined it was time to introduce a cartridge that had been in development by Roy Weatherby since the early 1960s—the 6.5-300 Weatherby Magnum. The 6.5-300 quite simply, does everything that the 6.5 Creedmoor does, but better. An increase in speed of over 500 fps is just the start.