[Tallguy]

You don't use 12~16" projectiles against aircraft. That would be like trying to use a 30-06 to shoot down flies.

I think that the Japanese had a kind of 'Beehive' round for their 18" naval gun. Don't know if it was ever fired in action.

[Stonewall Jackson]

During its final sortie to Okinawa, Yamato opened fire with shotgun rounds in a last-ditch effort to break through the swarms of American aircraft. I couldn't find any record of whether or not they succeeded in downing any aircraft with these rounds.