Berry's Superior 223/5.56 Cal 55gr Full Metal Jacket Boat Tail. 56 Cal 55gr Full Metal Jacket Boat Tail - The Berrys .223/5.56mm 55gr Full Metal Jacket Boat-tail bullets come with the most consistent jackets and are built around the tightest tolerances making them the go-to round for the modern 5.56mm/.223 hand loader. Available now in our 1500 round MiniCan. Specifications for Berry's 28463 Superior 223/5.56 Cal 55gr Full Metal Jacket Boat Tail: Manufacturer: Berry's Manufacturing Bullet Type: Full Metal Jacket Boat Tail (FMJBT) Bullet Weight: 55 grain Projectile Caliber: .224 Caliber Diameter: 0.224 in Sectional Density: 0.157 Number of Rounds: 1500 Berry's 28463 Superior 223/5.56 Cal 55gr Full Metal Jacket Boat Tail