Smokeless magnum rifle powder. This top-performing powder for big game loads provides excellent metering, and is the powder of choice for .270, 7mm magnum and .300 Win Mag. Powder of choice for 7mm Mag & .300 Win Mag, Excellent metering, Accurate and consistent. Principal Purpose-Magnum rife. Secondary Uses-Heavy bullet stand rifle. Remarks -Outstanding in 7mm and .300 Win Mag applications.