12 inch/50 Mark XI (305 mm)

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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

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
Mark IIa HE HE 72 72 72 72 72 72
Mark VIa APC APC 534 483 420 375 341 295
Mark VIIa SAPCBC SAPCBC 283 256 222 198 180 156
Shell details
Ammunition Type of
mass (kg)
Fuse delay
Fuse sensitivity
Explosive mass
(TNT equivalent) (kg)
0% 50% 100%
Mark IIa HE HE 869 386 0 0.1 53.13 79° 80° 81°
Mark VIa APC APC 869 389.8 0.025 17 13.2 48° 63° 71°
Mark VIIa SAPCBC SAPCBC 869 386 0.035 17 36.3 48° 63° 71°

Comparison with analogues

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Usage in battles

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Pros and cons

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The launch of HMS Dreadnought in 1906 changed battleship construction when it was introduced. Overnight, the entire fleet of battleships in navies across the globe was obsolete thanks to the introduction of a new all-big-gun design instead of a large secondary battery. What followed the launch of this ship was a global arms race as the major navies around the world began building or ordering their own dreadnoughts. The new Liberal Government that took over Parliament, however, was more conservative in its warship construction. After the launch of the Bellerophon class, capital ship construction was put on hiatus while the British attempted to negotiate a limit to the calibre of naval cannons at the 1907 Hague Convention. When Germany refused to agree to such restrictions, however, Britain rejoined the arms race and approved the construction of the Saint Vincent-class dreadnoughts on June 12th, 1907. The Royal Navy was always looking to improve the firepower of their new ships by taking advantage of newer technological innovations to improve the range and destructive power of their guns. As such the 12-inch 50-calibre Mark XI was created as an improved version of the Mark X guns used on prior ships with a barrel that was five calibres longer and a larger propellant charge. It also replaced the screw collar on the Mark X with a breech ring.

Originally mounted on the Saint Vincent class, they were soon mounted on HMS Neptune which replaced the single forward turret, two rear turrets, and two wing turret configuration found HMS Dreadnought with a staggered "en echelon" gun arrangement that theoretically allowed for all the guns to fire in a broadside such as with Delaware-class dreadnoughts in the United States Navy with their centerline gun arrangement, but in practice, this was only done during an emergency as the blast was found to damage the ship's superstructure. Ironically, it was this concern that led to the rejection of the centerline arrangement by the Royal Navy. The Mark XI had other problems also. Despite the higher muzzle velocity being intended to improve accuracy, it was found the guns were wildly inaccurate due to the propellant charges not completely burning before exiting the barrel. This problem led to unpredictable muzzle velocities and a dispersion pattern between two and three acres. The original prototypes tested by Vickers on HMS Vanguard had a long cylindrical chamber and weren't wired up to the muzzle. However, one of the test guns developed a cracked liner after firing the equivalent of 38 full-service rounds due to the tolerances not allowing for shrinkage for parts, and even if it was allowed, the guns would still be unreliable. The Mark XI* was produced to correct the problem with a thin B hoop that overlapped the jacket along with a larger C hoop partially covering it. While interchangeable with the original Mark XI, the XI* was 1 ton heavier. The Mark XII was produced later with wiring all the way up the casing. It was interchangeable with, and the same weight as, the Mark XI and found service on the Colossus-class dreadnoughts built from 1909-1911. The failure to significantly improve left the Royal Navy with the opinion that they had reached the limits of what could be accomplished with 12-inch guns. The Colossus would become the last class to mount this calibre. The Royal Navy would begin designing larger calibre guns to get their desired performance which created the 13.5 inch/45 Mark 5.


Excellent additions to the article would be video guides, screenshots from the game, and photos.

See also

External links

Britain naval cannons
20 mm  20 mm/70 Oerlikon Mk.II · 20 mm/70 Oerlikon Mark V · 20 mm/70 Oerlikon Mark 24
40 mm  2pdr QF Mk.IIc · 2pdr QF Mk.VIII · 2pdr Rolls Royce · QF Mark V · QF Mark VII · QF STAAG Mark II
47 mm  3 pdr QF Hotchkiss
57 mm  6pdr 7cwt QF Mk IIA · 6pdr QF Mk.V
76 mm  3 inch 12pdr 12 cwt QF Mk.V · 3 inch/70 Mark 6 · 76 mm/45 QF 3in 20cwt HA Mark I · 76 mm/50 12pdr 18cwt QF Mark I · OQF 3in 20cwt
102 mm  4 inch/40 QF mark III · 4 in QF Mark V · 4 inch/45 Mark XVI · 4 inch/50 BL Mark VII · BL Mark IX
114 mm  4.5 inch/45 QF Mark IV · 4.5 inch/45 QF Mark V · 8cwt QF Mk I
120 mm  4.7 inch/45 Mk.XII
133 mm  5.25 inch/50 QF Mark I
152 mm  6 inch/45 BL Mark VII · 6 inch/45 BL Mark XII · 6 inch/50 BL Mark XXIII · 6 inch/50 QF Mark N5
190 mm  7.5 inch/45 BL Mk.VI
203 mm  8 inch/50 Mark VIII
305 mm  305 mm/45 Mark X · 12 inch/50 Mark XI
343 mm  13.5 inch/45 Mark 5(H) · 13.5 inch/45 Mark 5(L)
381 mm  15 inch/42 BL Mark I
20 mm  Rh202 (Germany)
40 mm  Bofors L/60 Mark 2 (USA) · Bofors L/60 Mark 3 (USA)
76 mm  3 inch Mk.33 (USA) · 76 mm/62 OTO-Melara Compact (Italy)