Winchester StaBALL HD is a temperature-insensitive, double-base, BALL Powder, stable in extreme-hot or -cold conditions. This slow-burning magnum powder provides optimal loading density in large capacity magnum cartridges appropriate for the burn speed, which is ideal for 6.5 PRC, 7MM Remington Mag, 300 PRC and many more. Typical of a BALL powder, precise metering contributes to improved velocity and lower standard deviations, ingredients that are paramount to match grade accuracy! This REACH-compliant, "environmentally green" propellant has copper fouling reducer additives, which contribute to shooting sessions without cleaning the bore. Velocity levels obtainable, depending on the cartridge, are 75-100fps greater than other propellants in its class. Thus, the StaBALL family provides Stability, Precision and Speed.