The US considered using 18" guns on the Montana class - but decided to stick with the 16" 50 caliber guns used on the Iowa class. They didn't gain much in range or accuracy with the 18" gun (that they designed) and the broadside weight with only 8 18" guns (4 turrents of 2 guns) was lighter than the broadside weight of 12 16" guns (4 turrents of 3 guns).
Since they knew this they must have built one or two 18" guns for testing.
The Japanese battleships with 18" guns had a slight range advantage over the 16 50s of the Iowa class - but they couldn't utilize the extra range because they had no means for optical aiming over the horizon - the Iowa class could aim using their radar that was mounted on the highest point of the ship making shots over the horizon possible.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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