12 inch/50 Mk.7 (305 mm)

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12 inch/50 Mk.7 cannons on the USS Wyoming


Write an introduction to the article in 2-3 small paragraphs. Briefly tell us about the history of the development and combat using the weaponry and also about its features. Compile a list of air, ground, or naval vehicles that feature this weapon system in the game.

Vehicles equipped with this weapon

General info

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Available ammunition

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Penetration statistics
Ammunition Type of
Penetration @ 0° Angle of Attack (mm)
1,000 m 2,500 m 5,000 m 7,500 m 10,000 m 15,000 m
Cl.B HE HE 68 68 68 68 68 68
Mk.15 APC APC 562 501 416 348 293 221
Shell details
Ammunition Type of
mass (kg)
Fuse delay
Fuse sensitivity
Explosive mass
(TNT equivalent) (kg)
0% 50% 100%
Cl.B HE HE 823 335.65 0 0.1 33.25 79° 80° 81°
Mk.15 APC APC 884 394.62 0.035 17 11.11 48° 63° 71°

Comparison with analogues

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Usage in battles

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Pros and cons

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Boasting one of the longest continuous services of any large calibre weapon in the United States Navy's history, the 12 inch/50 Mark 7 was developed as an incremental improvement over the 12-inch/45 Mk.5. After the Florida-class was completed, the US Navy considered up-gunning to 14-inch guns as the Royal Navy had just adopted the 13.5 inch/45 Mark 5(H) guns. However, the Navy Bureau of Ordnance feared construction of a new calibre of naval cannon would delay the construction of the ships which became the Wyoming-class battleships, the USS Wyoming and USS Arkansas which entered service in 1912. To improve the capabilities of the 12 inch guns, the length was once again increased by five calibres to improve the range and penetration capabilities. The USS Wyoming and USS Arkansas were the only ships in the US Navy to use this cannon as the Navy would soon upgrade to 14-inch guns after they completed with the extra time given from using 12-inch guns on the Wyoming-class. Regardless, the US Navy would keep the guns in service until 1946 when the USS Arkansas was destroyed in a nuclear bomb test at Bikini Atoll (present day Marshall Islands) in 1946. The only other navy to use the 12"/50 Mark 7 is the Argentinian Navy. Disputes over the Patagonian and Beagle Channels with Chile and the River Plate with Brazil in the late 1800s and early 1900s sparked a dreadnought arms race on the continent of South America. Fore River Shipbuilding won a design bid for the Rivadavia-class dreadnoughts armed with similar twelve inch guns made by Bethlehem Steel Shipbuilding, which kept the Mark 7 in service until 1953.


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See also

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  • reference to the article about the variant of the cannon/machine gun;
  • references to approximate analogues by other nations and research trees.

External links

USA naval cannons
20 mm  20 mm/70 Oerlikon Mk.II · 20 mm/70 Oerlikon Mark V · 20 mm/70 Oerlikon Mark 24
25 mm  25 mm/87 Mk.38
28 mm  1.1 inch/75 Mk.1
37 mm  AN-M4
40 mm  Bofors L/60 Mark 1 · Bofors L/60 Mark 2 · Bofors L/60 Mark 3
76 mm  3 inch/23 Mk.4 · 3-inch/50 Mk.10 · 3-inch/70 Mk.37 · 3-inch Mark 10 · 3 inch Mk.33 · 3-inch Mk.34
102 mm  4 inch/50 Mk.9
127 mm  5 inch/25 Mk.11 · 5 inch/25 Mk.13 AA · 5 inch/38 Mk.12 · 5-inch/50 Mk.5 · 5 inch/51 Mk.7 · 127 mm/54 Mark 18
152 mm  6 inch/47 Mk.16 · 6 inch/47 DP Mk.16 · 6 inch/53 Mk.12 · M81
203 mm  8 inch/55 Mark 9 · 8 inch/55 Mark 12 · 8 inch/55 Mark 14 · 8 inch/55 Mark 16
305 mm  12-inch/45 Mk.5 · 12 inch/50 Mk.7 · 12 inch/50 Mk.8
356 mm  14 inch/45 Mk.8 · 14 inch/45 Mk.12 · 14 inch/50 Mk.11