4.5 -45 caliber gun: 4.5"-45 caliber gun : From 1938 to 1966, the Royal Navy's standard series of medium naval guns. [100%] 2023-06-13
18.1 -45 caliber naval gun: 18.1"-45 caliber naval gun : Largest caliber naval gun ever deployed on a battleship; used by the Japanese Yamato-class but never fired against a ship or shore target. [89%] 2023-06-12
120 mm 45 caliber Pattern 1892: The 120mm 45 caliber Pattern 1892 was a Russian naval gun developed in the years before the Russo-Japanese War that armed a variety of warships of the Imperial Russian Navy during the Russo-Japanese War and World War I ... [81%] 2023-12-24 [Naval guns of Russia] [Russo-Japanese war weapons of Russia]...
254 mm 45 caliber Pattern 1891: The 254 mm 45 caliber Pattern 1891 was a Russian naval gun developed in the years before the Russo-Japanese War that armed coastal defense ships and pre-dreadnought battleships during the Russo-Japanese War and World War I. Guns ... [81%] 2024-08-23 [Artillery of the Russian Empire] [Russo-Japanese war weapons of Russia]...
16 -45 caliber MK 6 naval gun: The 16"-45 caliber MK 6 naval gun was a U.S. battleship main cannon used on the North Carolina-class and South Dakota-class, but rejected in favor of the 16"-50 caliber MK 7 naval gun for the ... [75%] 2023-08-17
From search of external encyclopedias: