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12"/50 caliber Bethlehem gun
ARA Moreno 305mm gun
a main gun of the battleship ARA Moreno during its construction, sometime between 1910 and 1915.
Type Naval gun
Place of origin United States
Service history
In service 1915–1956[1][2]
Used by Rivadavia-class battleships
Wars World War I, World War II
Production history
Designed 1910
Manufacturer Bethlehem Steel Corporation[1]
Weight 66 tons[1]
Barrel length 50 ft 6 in (15.39 m) bore (50 cal)[1]

Caliber 12 inches (304.8 mm)[1]
Recoil 38 inches (97 cm)[1]
Rate of fire 2.0–3.0 rounds per minute[1]
Maximum range 24,000 yd (22,000 m)[1]

The 12"/50 caliber Bethlehem gun was a US naval gun designed in 1910 as the main armament for the Argentine Navy’s dreadnought battleships of the Rivadavia class.


The gun was designed in 1910, and it was probably based on the US 12"/50 (30.5 cm) Mark 7 naval gun with a breech weight added. The guns were manufactured at the Bethlehem Steel Corporation.[1] The ships in the class had twelve 305 mm guns each, mounted in six twin (2-gun) turrets, with two turrets forward, two aft, and one on each side.

Measurements and CapabilitiesEdit


Main deck and guns of Moreno

The gun weighed 66 tons including the breech and was capable of an average rate of fire of 2–3 rounds a minute. It could throw a 870 lb. (394.6 kg) Mark 15 armor piercing shell 24,000 yards (21,950 meters) at an elevation of 14.7°, while the "barrel life" of the guns was 200 shots.

The previous 12" gun, manufactured for the U.S. Navy, was the Mark 7 version, which had been designed and installed in the 1912 era Wyoming-class battleships.[1]


This gun was only installed in the Argentine Navy Rivadavia-class battleships ARA Rivadavia and ARA Moreno.

See alsoEdit


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 DiGiulian, Tony. "Argentina - 12"/50 (30.5 cm) Bethlehem". Archived from the original on 14 January 2010. Retrieved 22 February 2010. 
  2. 1956 is the year the Argentinian battleships were decommissioned.

External linksEdit

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