Using youtube translate so I might misunderstand. Yamato carried 9 18.inch (46cm) naval rifles in 3 triple mounts. Had a top speed of 27 knots and was bigger then all battleships in the world.
@@bookmt.2747 yamato had 6 guns in two turrets at the front and 3 in the back on a single turret. Also the yamato is the biggest class of battleships period by tonnage(classified not as a super dreadnought but as a super battleship, much bigger then other battleships of the time.) . Iowa might be longer but that's more for speed design. Yamato is wider and more like a south dakato in hull shape for a better and more stable gun platform for her 46 cm guns.