The primary armament of an Iowa-class battleship consisted of nine breech-loading 16 inch (406 mm)/50-caliber Mark 7 naval guns,[1] which were housed in three 3-gun turrets: two forward and one aft in a configuration known as “2-A-1”. The guns were 66 feet (20 m) long (50 times their 16-inch (410 mm) bore, or 50 calibers, from breechface to muzzle).[2]About 43 feet (13 m) protruded from the gun house. Each gun weighed about 239,000 pounds (108 000 kg) without the breech, or 267,900 pounds with the breech.[3][4] They fired 2,700 pounds (1,225 kg) armor-piercing projectiles at a muzzle velocity of 2,500 ft/s (762 m/s), or 1,900 pounds (862 kg) high-capacity projectiles at 2,690 ft/s (820 m/s), up to 24 miles (21 nmi; 39 km).
1900 lb. projectile at 2690 fps? Just Wow!!!