Winchester StaBall HD is at temperature-insensitive 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 pressure standard deviations, ingredients that are paramount to match grade accuracy! This "environmentally green" propellant has copper fouling reducer additives, meaning longer durations of competition and field shooting without having to clean the bore. Precision accuracy throughout the match! Velocity levels obtainable, depending on the cartridge, are 75-100 fps greater than other propellants in its class. Thus, the StaBALL family provides Stability, Precision and Speed. Other Important Information: Do not exceed the loads displayed in the reloaders guide. Never mix any two powders...