Talk:Nashorn/@comment-38926561-20190411195524/@comment-34517845-20190411200544

Well, the USS Iowa was the last one, with her 16 inch guns.

Yamato had one of the largest guns, though it was 460mm.

The true biggest gun was the BL-18 inch MkI breech loading gun, which was 457.2mm in calibre size.