For serious rifle competition, you'll be in championship company with MatchKing bullets. The hollow point boat tail design provides that extra margin of ballistic performance match shooters need to fire at long ranges under adverse conditions. Sierra's exacting tolerances assure record-breaking accuracy you can depend on, box after box. .338 Caliber MatchKing 300 Grain HPBT=Hollow Point Boat Tail Diameter: .338/8.59mm Sectional Density: .375 Ballistic Coefficients: .768 @ 2150 fps and above; .750 @1800 fps and below. Note: These are component bullets, not loaded ammunition.