Originally posted by Karnak
No, the 18s hit harder. Just the Yamato's fire control wasn't nearly as good and it's AA wasn't as good.
Yamato's 18.1" guns threw more weight than the Iowa's 16"/50 cal guns, but the 16" shells were better designed and offered superior penetration. Basically, it's a wash. In addition, the Iowas were armored with super-hard STS plate, which for a given thickness was superior to the armor of the Yamato. While a bit thinner than the that of the Yamato, the Iowas were just as resistant to penetration. So far, very even.
Thus, with vastly better fire control (radar), the Iowas would almost certainly score first and more often. Therefore, the Yamato would find itself out-gunned by the Iowa. Adding to its woes, the Yamato was 6 knots slower, meaning that the Iowa could dictate the terms of the engagement.
I'm not sure that the Yamato could cope with the South Dakota class either.
My regards,
Widewing