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Originally Posted by akdavis
ARMOR-PIERCING (AP) - AP projectiles are designed to penetrate their caliber of class A arrnor plate. A 5-inch projectile will penetrate 5 inches of armor, and so on.
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That's an interesting quote, since the 16"/50 will penetrate more than twice its diameter in the best armor at point-blank range, and will penetrate its own diameter at 25,000 yards; and it's not uncommon (if you'll forgive the pun) among naval rifles.
http://www.navweaps.com/Weapons/WNUS_16-50_mk7.htm
Another interesting note is that US subs carried common, and maybe 'special common', and not much else, except possibly some starshells. Why? Because there was no 5" AP round made.
http://www.navweaps.com/Weapons/WNUS_5-38_mk12.htm