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.