The 6.5 WBY RPM is based on a lengthened version of the existing 284 Winchester. This cartridge has a rebated rim, making it compatible with standard 30-06 bolt faces and reloading equipment. However, the large body diameter, low body taper, and 35-degree shoulder mean that case capacity is greatly increased, leading to higher velocities. In addition, bullet innovation in the 6.5mm category is highly efficient with less drop and wind deflection than many heavier calibers. All these details culminate into a cartridge that delivers 1,500 foot-pounds of energy at 500 yards capable of ethically taking big game animals across the globe.