I believe some Japanese WW2 battleships had 21" guns. I don't know whether they were ever used in anger, and the Americans somehow dealt with the Japanese super-battleships without sustaining too much damage.
There's some very good colour footage of the battle of Midway, mostly fought with smaller guns and aircraft though as I remember it. Great spectacle, the whole atmosphere filled with strings of explosive projectiles going in all directions.
Not sure one would have wanted to be there however.
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