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16"/50 caliber Mark 7 gun
The 16"/50 caliber Mark 7 - United States Naval Gun was originally intended to fire the relatively light 2,240 pound (1,016 kg) Mark 5 armor piercing shell, the shell handling system for these guns was redesigned to use the "super-heavy" 2,700 pound (1225 kg) APC (Armor Piercing, Capped) Mark 8 before any of the Iowa-class battleships were laid down. This heavier projectile made these guns nearly the equal in terms of penetration power to the 460 mm (18.
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