quoheleth, As I recall those guns were 16 inchers not 18 inches.
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dmp
That would be Yamato and Musashi both armed with 9 x 18.1"/45 Type 94 firing a 3,219 lbs projectile up to 45,960 yards at 46 degrees. Each gun weight 363,000 lbs set in a 3 gun turret which weight 2,730 tons, 3 turrets per ship. Each turret weight as much as a destroyer.The Japs sailed two monsters w/18" guns, I believe, both sunk
That would be Shinano which was started as the 3rd ship of the Yamato class but after Midway the incomplete Shinano was finished as a carrier. So there was suppose to be three Yamato class ships build but before Shinano could be completed as such the aircraft carrier proved itself.One got torpedoed before even making it into a single sea battle