In WWII...
The Japanese built a couple of super-battleships - Yamato and Musashi -displacing almost 73,000 tonnes! They were the pinnacle of the "old school" navy with 9 x 18" guns, and were strangely at odds with the Japanese progress in carrier warfare, demonstrating the superiority of naval airpower. Over time, these were fitted with more and more anti-aircraft weaponry, including a rather strange 18" anti-aircraft "shotgun" shell.
There is no record of success with this armament...
