IMR 8208 XBR is an accurate-metering, super short-grained extruded rifle powder was designed expressly for match, varmint, and AR sniper cartridges. As a medium burn speed propellant, XBR is ideally suited for cartridges like the 223 Remington/5.56mm, 308 Winchester/7.62mm NATO and the 6mm PPC. Shooters will find IMR 8208 XBR yields max velocities and "tack driving" accuracy. Clearly, the competitor's "choice" and the Varmint Hunter's "dream powder." Check your reloading manual or go to a powder manufactures website for load data.