Difference between revisions of "M256 (120 mm)"

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== Description ==
 
== Description ==
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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 ===
 
=== Vehicles equipped with this weapon ===
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=== Available ammunition ===
 
=== Available ammunition ===
''Describe the shells that are available for the weapon and their features and purpose. If it concerns autocannons or machine guns, write about different ammo belts and what is inside (which types of shells).''
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<!-- ''Describe the shells that are available for the weapon and their features and purpose. If it concerns autocannons or machine guns, write about different ammo belts and what is inside (which types of shells).'' -->
  
<big>'''American ammunition'''</big>
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'''American ammunition'''
  
 
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'''<big>Export ammunition</big>'''
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! colspan="8" |'''Penetration statistics'''
 
! colspan="8" |'''Penetration statistics'''

Revision as of 21:57, 14 March 2021

Description

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

Tell us about the tactical and technical characteristics of the cannon or machine gun.

Available ammunition

American ammunition

Penetration statistics
Ammunition Type ofwarhead Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
M830 HEATFS 480 480 480 480 480 480
M830A1 HEATFS 350 350 350 350 350 350
M829 APFSDS 491 488 481 473 464 454
M829A1 APFSDS 598 596 589 580 570 560
Shell details
Ammunition Type ofwarhead Velocity(m/s) ProjectileMass (kg) Fuse delay(m) Fuse sensitivity(mm) Explosive Mass(TNT equivalent) (g) Ricochet
0% 50% 100%
M830 HEATFS 1,140 13.1 0.05 0.1 2,360 65° 72° 77°
M830A1 HEATFS 1,410 11.4 0.05 0.1 1,390 65° 72° 77°
M829 APFSDS 1,670 3.94 N/A N/A N/A 78° 80° 81°
M829A1 APFSDS 1,569 4.64 N/A N/A N/A 78° 80° 81°

Export ammunition

Penetration statistics
Ammunition Type ofwarhead Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
KE-W APFSDS 583 579 569 556 542 528
Shell details
Ammunition Type ofwarhead Velocity(m/s) ProjectileMass (kg) Fuse delay(m) Fuse sensitivity(mm) Explosive Mass(TNT equivalent) (g) Ricochet
0% 50% 100%
KE-W APFSDS 1,585 4.00 N/A N/A N/A 78° 80° 81°

Comparison with analogues

Give a comparative description of cannons/machine guns that have firepower equal to this weapon.

Usage in battles

Describe the cannon/machine gun in the game - its distinctive features, tactics of usage against notable opponents. Please don't write a "guide" - do not impose a single point of view, but give the reader food for thought.

Pros and cons

Pros:

  • M829, KE-W (on the M60 AMBT), and M829A1 (on the M1A2 Abrams) are amongst the most powerful shells in the game, with M829A1 having the third highest penetration after the German DM53 and the Italian CL3143.
  • The M256 on the M1A2 Abrams has access to the high velocity, proximity-fused M830A1 HEAT-MP shell, enabling the M1A2 to engage helicopters and low flying aircraft with devastating (and often hilarious) results. A direct hit isn't needed either due to the large amount of explosive filler and wide blast radius.
  • Reload is comparable to other NATO MBTs - 7.8 seconds stock and 6 seconds with an aced crew.
  • Relatively wide selection of shells - 1 APFSDS shell (M829) and 1 HEAT-FS shell (M830) on the M1A1, 2 APFSDS shells (M829 and M829A1), 1 standard HEAT-FS shell (M830) and 1 HEAT-MP shell (M830A1) on the M1A2 Abrams, the M60 AMBT gets access to the powerful KE-W APFSDS shell and the M830 HEAT-FS shell.
  • M830A1 is the fastest HEAT based shell in the game with a muzzle velocity of 1,400 m/s.
  • Extremely high muzzle velocity on M829, KE-W, and M829A1 makes longe range sniping a satisfying experience - M829 has the highest muzzle velocity out of the 3 APFSDS shells available.
  • Great gun handling characteristics - the gun elevates towards +20 and depresses towards -10 very quickly.
  • Very effective stabiliser - does not stop working at high speeds.

Cons:

  • Poor stock grind - enemy tanks are very capable of withstanding M830 HEAT-FS.
  • M830A1 is not effective against enemy MBTs - it only has 350 mm of chemical-based penetration.
  • The M256 on the M1A1 Abrams and M60 AMBT do not get access to the M829A1 APFSDS shell and the M830A1 HEAT-MP shell.
  • M830A1 needs to travel a certain distance to arm the fuse - unable to engage helicopters at close range, except for a direct hit.
  • The reload isn't very impressive compared to contemporary tanks like the Leopard 2A5/6, the Strv 122, the Ariete and the Leclerc. The Type 90 and Challenger 2 beat it by a full second.
  • M830A1 self-destructs at 4.5 kilometres - helicopters can engage the M1A2 way beyond that range.

History

In 1972, as the a replacement to the cancelled MBT-70 and XM-803 was beginning development by Chrysler and GM, a 120 mm smoothbore gun had been considered. However, the developing gun by West Germany was not expected to be produced in time to meet the scheduled production timeline, and so the 105 mm M68 was retained as the main armament for the upcoming design.[1] In 1976, during the decision on which company will receive the contract to produce the XM-1 tank, a separate decision was made for the tank to be able to accommodate a 120 mm gun in the future, either the British 120 mm rifled gun or the German smoothbore gun. On October 28th, the XM-1 designs were modified with this new requirement.[2] Chrysler eventually won the contract to produce the tanks, but they were armed with the 105 mm M68A1.

The German Rheinmetall 120 mm was eventually chosen to become the next tank armament for US tanks. Receiving a license to produce it, the Watervliet Arsenal produced the Rheinmetall cannon as the M256.[3] With the original Rheinmetall design considered overly complex and expensive, the M256 had been redesigned with fewer parts.[4]

Media

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

See also

Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:

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

External links

References

  1. Hunnicutt 1990, p.163
  2. Hunnicutt 1990, p.190
  3. Hunnicutt 1990, p.224
  4. Zaloga 1993, p.10

Bibliography

  • Hunnicutt, R.P. Abrams: A History of the American Main Battle Tank. Presidio Press, 1990
  • Zaloga, Steven. M1 Abrams Main Battle Tank 1982-1992. Osprey Publishing Ltd., 1993


USA tank cannons
20 mm  M139
25 mm  LW25 · M242
37 mm  M3 · M5 · M6
57 mm  M1
75 mm  M2 · M2 Howitzer · M3 · M6 · M1897A4 · XM274
76 mm  M1 · M7 · M32 · T185E1
90 mm  M3 · M3A1 · M36 · M41 · M54 · T15E1 · T15E2 · T54 · T208E9
105 mm  M4 · M68 · M68A1 · M68A1E8 · T5E1 · T5E2 · T140E2 · T140E3 · XM35
106 mm  M40A1C
120 mm  M58 · M256 · T53
152 mm  M81 · M162 · XM150E5
155 mm  M185 · T7
165 mm  M135
  Foreign:
20 mm  Rh202 (Germany)
57 mm  6pdr OQF Mk.III (Britain) · ZIS-2 (USSR)
105 mm  Sharir (Israel)
120 mm  IMI MG251 (Israel)