7.62x51mm NATO
7.62x51mm NATO rounds compared to AA (LR6) battery.
Type	Rifle
Place of origin	United States
Service history
In service	1954-present
Used by	United States, NATO, others.
Specifications
Parent case	.300 Savage
Case type	Rimless, Bottleneck
Bullet diameter	7.82 mm (0.308 in)
Neck diameter	8.58 mm (0.338 in)
Shoulder diameter	11.35 mm (0.447 in)
Base diameter	11.84 mm (0.466 in)
Rim diameter	11.94 mm (0.470 in)
Rim thickness	1.27 mm (0.050 in)
Case length	51.05 mm (2.010 in)
Overall length	69.85 mm (2.750 in)
Rifling twist	1:12"
Primer type	Large Rifle
Maximum pressure	415 MPa (60,200 psi)
Ballistic performance
Bullet weight/type	Velocity	Energy
146.6 gr (9.50 g)	2,756 ft/s (840 m/s)	2,472 ft·lbf (3,352 J)
Source: Popenker [1][2]

The 7.62x51mm NATO is a rifle cartridge developed in the 1950s as a standard firearm cartridge among NATO countries. still-life: three NATO 7. ... ‹ The template below (Expand) is being considered for deletion. ... For other uses, see Battery. ... Image File history File links This is a lossless scalable vector image. ... This article is about the military alliance. ... A M4 Carbine just after firing, with an ejected case in mid-air The article titled casing is a disambiguation page. ... . ... This article is about firearms projectiles. ... Rifling of a Canon de 75 modèle 1897 A 35 caliber Remington, with a microgroove rifled barrel with a right hand twist. ... The percussion cap or primer was the crucial invention that enabled firearms to fire in any weather. ... A grain (symbol: grd) is a unit of mass equal to about 64. ... BIC pen cap, about 1 gram. ... Feet per second is a unit of speed; it expressses the number of feet traveled in one second. ... Metre per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector), defined by distance in metres divided by time in seconds. ... The foot-pound force (symbol: ft·lbf) is an English unit of work or energy from the English Engineering System. ... The joule (IPA: or ) (symbol: J) is the SI unit of energy. ... For other uses, see Rifle (disambiguation). ... This article does not adequately cite its references or sources. ... The 1950s decade refers to the years 1950 to 1959 inclusive. ... This article is about the military alliance. ...

The 7.62x51mm NATO cartridge was introduced to military service in rifles and machine guns. It was introduced in U.S. service in the M14 Rifle and M60 Machine gun in the late 1950s. Fabrique Nationale's FAL became the most popular 7.62 mm NATO rifle in Europe and served well into the early 1980s. The M14 was superseded in U.S. service as the infantry adopted a new intermediate round with the M16. However, the M14 and many other firearms that use the round remain in service. The round is used by infantry and from ground vehicles, aircraft and ships. M14 and M-14 redirect here. ... For other uses, see M60. ... Fabrique Nationale de Herstal, more often known as Fabrique Nationale and abbreviated simply as FN, is a well-known firearm manufacturer that originated in the Belgian city of Herstal, near Liège. ... The Fusil Automatique Leger, or Light Automatic Rifle (LAR). ... For other uses, see Europe (disambiguation). ... M16 (more formally United States Rifle, Caliber 5. ...

While similar in appearance, the military 7.62x51 NATO cartridge is not identical to the commercial .308 Winchester. However, their interchange is not listed as unsafe in either combination.^[3] NATO 7. ...

Some confuse the round with the 7.62x39mm intermediate cartridge used in the AK-47/AKM and other weapons, because both may be referred to simply as "7.62". They are not interchangeable. This article or section should include material from Soviet M1943 The Soviet 7. ... Avtomat Kalashnikova model 1947 g. ... The AKM (Russian: Автомат Калашникова Модернизированный; Avtomat Kalashnikova Modernizirovanniy or Kalashnikov automatic rifle modernized) is a 7. ...

Overview

The round itself offers similar ballistic performance in most firearms to the round it replaced in U.S. service, the .30-06 Springfield. While the cartridge itself is shorter, the actual bullet and loadings are about the same (muzzle velocities on the order of 860 m/s (2,800 ft/s) for both). Due to more modern propellants, less volume could be dedicated to holding them in the 7.62x51mm cartridge than was needed in the .30-06. The smaller case uses less brass, and firearms that use the round can be smaller, but the reduced size limits flexibility in civilian use, hindering performance with heavier bullets and slower-burning, lower-density powders (see internal ballistics). .30-06 Springfield cartridge specifications. ... Internal ballistics, a subfield of ballistics, is the study of a projectiles behavior from the time its propellants igniter is initiated until it exits the gun barrel. ...

Development

The development work that would eventually develop into the 7.62x51mm NATO started just after World War I, when it became clear that the long cartridge of the U.S. standard .30-06 round made it difficult to use in semi- and fully automatic weapons (the .30-06 was in turn derived from an earlier .30-03 cartridge), and had more case capacity than was needed. A "shorter" round would allow the firing mechanism to be made much smaller, and improve the feeding, both of which would allow for higher rates of fire. At the time one of the most promising designs was the .276 Pedersen, but in 1932 it was rejected with an Army recommendation that only rounds of .30 inch (7.62 mm) would meet requirements. “The Great War ” redirects here. ... Walther P99, a semi-automatic pistol from the late 1990s A semi-automatic firearm is a gun that requires only a trigger pull for each round that is fired, unlike a single-action revolver, a pump-action firearm, a bolt-action firearm, or a lever-action firearm, which require the... M2 machine gun An automatic firearm is a firearm that uses the energy of firing to extract and eject the fired cartridge case, and load a new case. ... The . ... En-Block clip loaded with 10 rounds of . ...

Thus when the war appeared to be looming again only a few years later, the .30-06 was the only round available. Nevertheless the U.S. Army did use it to great effect in the M1 Garand, which provided U.S. troops with considerably higher firepower than most of their bolt-action-armed opponents. The Garand performed so well that the U.S. saw little need to replace it until almost a decade later, and the .30-06 remained in service well beyond the Korean War and into the 1960s. The United States Army is the largest and oldest branch of the armed forces of the United States. ... The M1 Garand (more formally the United States Rifle, Caliber . ... Half-opened bolt on a Winchester Model 70. ... Belligerents United Nations: Republic of Korea Australia Belgium Canada Colombia Ethiopia France Greece Luxembourg Netherlands New Zealand Philippines South Africa Thailand Turkey United Kingdom United States Naval Support and Military Servicing/Repairs: Japan Medical staff: Denmark Italy Norway India Sweden DPR Korea PR China Soviet Union Commanders Syngman Rhee Chung...

During the 1940s and early 1950s several experiments were carried out to improve on the Garand. One of the most common complaints was the difficulty in reloading the weapon using its en bloc clips, and many experimental designs modified the weapon with a detachable box magazine. One of these, Springfield Armory's T20, was a fully automatic version. The U.S. Army found that this weapon performed so well that they began to consider replacing the Garand, and decided it was also time to look at improved ammunition once again. The 1940s decade ran from 1940 to 1949. ... The 1950s decade refers to the years 1950 to 1959 inclusive. ... A clip is a device that is used to store multiple rounds of ammunition together as a unit, ready for insertion into the magazine of a repeating firearm. ... A 30-round STANAG magazine. ... This is an article about the US Government Arsenal. ...

The test program continued for several years, including both the original .30-06 round and a modified .300 Savage (then known as the T65). In the end, the T65 design demonstrated power roughly equal to the original .30-06, firing a 147-grain bullet at 2,750 feet per second, while being somewhat shorter and much more reliable in feeding. The T44, an adaptation of the T20 to fire the new round, was the almost-uncontested winner of the competition. . ... The word grain has several meanings, most being descriptive of a small piece or particle. ... M14 and M-14 redirect here. ...

The 7.62 mm M118 long range cartridge.

When the U.S. announced its intentions to introduce the T65, the British were incensed. They had considerable evidence to demonstrate that their own .303 British could not be fired controllably in a shoulder-fired automatic rifle, and the somewhat more powerful T65 would be even harder to control. They had spent considerable time and effort developing an intermediate-power round, the .280 British, to solve these problems. The U.S. countered with its pre-WWII requirements that stated that only a .30-caliber design would do. After considerable squabbling between the two armed forces, the argument was settled when the Canadian Army announced they would be happy to use the .280, but only if the U.S. did as well — this amounted to a tacit agreement to use the T65, as it was clear the U.S. would not use the .280. The T65 was chosen as the NATO standard in 1954. The Canadian First Army was the overall command for the Canadian military forces in Europe during World War II. It was formed in early 1942 to command two corps composed of the three infantry divisions, two armoured divisions, and two armoured brigades that had assembled in England. ...

The T44 was adopted as the M14 in 1957. Britain and Canada began receiving FN FALs around the same time, as the West German army adopted a modified version of the Spanish CETME rifle, as the Heckler & Koch G3. However it was not long before those involved realized the British had been right all along: the .308 could not be fired accurately in fully automatic due to recoil. M14s were later delivered with the fully automatic selection locked out, and adaptations to the FAL to allow it included the addition of a bipod and heavier barrel. M14 can stand for: Messier object M14, a globular cluster; see Messier 14 a battle rifle; see M14 (rifle) Michigan State Highway 14 M-14. ... The Fusil Automatique Leger, or Light Automatic Rifle (LAR). ... The name CETME is an acronym for Centro de Estudios Técnicos de Materiales Especiales, a Spanish government design and development establishment. ... The G3 is a 7. ... M2 Browning machine gun An automatic firearm is a firearm that automatically extracts and ejects the fired cartridge case, and loads a new case, usually through the energy of the fired round. ... An early naval cannon design, allowing the gun to roll backwards a small distance when firing The recoil when firing a gun is the backward momentum of a gun, which is equal to the forward momentum of the bullet or shell, due to conservation of momentum. ... A bipod is a support device that is similar to a tripod or monopod, but with only two legs. ... The barrel of a firearm is the tube, usually metal, through which a controlled explosion is released in order to propel a projectile out of the end at great speed. ...

While all of this was going on, the U.S. Project SALVO concluded that a burst of four rounds into a 20-inch circle would cause twice the number of casualties as a fully automatic burst by one of these battle rifles — regardless of the size of the round. They suggested using a much-smaller .22 caliber cartridge with two bullets per cartridge (a "duplex load"), while other researchers investigated the promising flechette rounds that were even lighter but offered better penetration than even the .30-06. These studies were kept secret in case the British found out about them and used as evidence in favour of their smaller rounds. In automatic firearms, burst mode or burst fire is a firing mode enabling the shooter to fire a predetermined number of rounds (usually 2, 3 or 4) at a time with a single pull of the trigger—this firing mode is commonly used in submachine guns, assault rifles and carbines. ... The word flechette is French and means dart (literally, little arrow). It is a projectile having the form of a small metal dart, usually steel, with a sharp-pointed tip and a tail with several vanes to stabilize it during flight. ...

When the M14 arrived in Vietnam, it was found to have a few disadvantages. The rifle's length was not well suited for jungle warfare. Also, the weight of 7.62x51mm cartridges limited the total amount of ammunition that could be carried when compared with 7.62x39mm AK-47 ammunition. This article or section should include material from Soviet M1943 The Soviet 7. ... Avtomat Kalashnikova model 1947 g. ...

Fighting between the big-round and small- groups reached a peak in the early 1960s, when test after test showed the .223 Remington round fired from the AR15 allowed an 8-soldier unit to outgun an 11-soldier unit armed with M14s. U.S. troops were able to carry more 5.56x45mm NATO ammunition which would allow them a better advantage against a typical NVA unit armed with AK-47s. In 1964, the U.S. Army started replacing their M14s with the M16, incurring another series of complaints from the British. The . ... This article or section should include material from Colt AR-15 SP1 ar-15. ... U.S. Military 5. ... The Peoples Army of Vietnam (PAVN) is the term used by the Vietnamese for their armed forces. ...

Regardless of the M14 having disadvantages in jungle warfare, 7.62x51mm NATO rifles stayed in military service around the world due to several factors. The 7.62x51mm NATO has proved much more effective than 5.56x45mm at long ranges, and has since found popularity as a sniping round. For instance, M14 variants such as the M21 are still used in the United States military as designated marksman and sniper rifles. Shorter, easier to handle 7.62mm rifles like the Heckler & Koch G3 stayed in service due to their accuracy, range, cartridge effectiveness and reliability. The M21 Sniper Weapon System (SWS) is the semi-automatic sniper rifle adaptation of the popular M14 rifle. ... The Designated Marksman (DM) is a military role in a U.S. infantry squad. ... For other uses, see Sniper (disambiguation). ... The G3 is a 7. ...

The 7.62x51mm NATO round nevertheless met the designer's demands for fully automatic reliability with a full-power round. It remained the main machine gun round for almost all NATO forces well into the 1990s, even being used in adapted versions of older .30-06 machine guns such as the Browning M1919A4 from the WWII era. These too have been replaced to some extent by .223 weapons, such as the widespread use of the FN Minimi, but they remain the primary armament on most flexible mountings such as helicopters, jeeps, and tanks. A machine gun is a fully-automatic firearm that is capable of firing bullets in rapid succession. ... The Browning M1919 was a . ... The FN Minimi is a squad automatic weapon — the name coming from Mini-mitrailleuse (French: mini-machine gun. It is a 5. ...

Winchester Ammunition (a division of the Olin Corporation) saw the market for a civilian model of the T65 cartridge and released it commercially in 1952 as the .308 Winchester, two years prior to adoption of the cartridge by NATO. The Olin Corporation (NYSE: OLN) is a major manufacturer of copper alloys (through subsidiary Olin Brass), ammunition (through the Winchester Ammunition), and chlorine and sodium hydroxide (Olin Chlor-Alkali Products). ...

Military Cartridge Types

• Cartridge, Grenade, L1A1 (United Kingdom): 7.62x51mm grenade launching cartridge with one subvariant (L1A2) with unknown differences.
• Cartridge, Ball, L2A1 (United Kingdom): 7.62x51mm ball cartridge, with three subvariants (A2-A4) with unknown differences.
• Cartridge, Tracer, L5A1 (United Kingdom): 7.62x51mm tracer cartridge, designed to last out to 1000 meters. Four subvariants exist, with brighter ignition (A2), tracer reduced to 750 meters (A3), with a pistol powder charge (A4), and with improved ballistics (A5).
• Cartridge, Caliber 7.62mm, NATO, Ball, F4 (Australia): 144-grain 7.62x51mm NATO ball cartridge. Australian equivalent to U.S. M80 round. In service with the Australian Defence Force.

7.62mm, NATO, Tracer, M62: 142-grain tracer cartridge.

• Cartridge, Caliber 7.62mm, NATO, Ball, M59 (United States): 150.5-grain 7.62x51mm NATO ball cartridge. A further development of the initial T65 cartridge.
• Cartridge, Caliber 7.62mm, NATO, Armor Piercing, M61 (United States): 150.5-grain 7.62x51mm NATO armor piercing round, black cartridge tip.
• Cartridge, Caliber 7.62mm, NATO, Tracer, M62 (United States): 142-grain tracer cartridge, orange cartridge tip.
• Cartridge, Caliber 7.62mm, NATO, Grenade, M64 (United States): 7.62x51mm NATO grenade launching blank.
• Cartridge, Caliber 7.62mm, NATO, Ball, M80 (United States): 146-grain 7.62x51mm NATO ball cartridge.
• Cartridge, Caliber 7.62mm, NATO, Match, M118 (United States): 173-grain 7.62x51mm NATO Full Metal Jacket Boat Tail round specifically designed for Match purposes. Introduced in 1968 as XM118, standardized in 1970 as M118. Produced at Lake City Army Ammunition Plant.
• Cartridge, Caliber 7.62mm, NATO, Ball, Special, M118 (United States): 173-grain 7.62x51mm NATO Full Metal Jacket Boat Tail round specifically designed for match purposes. Produced by Lake City Army Ammunition Plant. This is an interim match round which utilized M80 ball brass with the 173-grain FMJBT bullet. During this period in the early to late 1980s the performance of the round declined. Powder, primer, brass, bullets were no longer produced in matching lots.
• Cartridge, Caliber 7.62mm, NATO, Ball, Special, M118LR (United States): 175-grain 7.62x51mm NATO Hollow Point Boat Tail round specifically designed for long-range sniping. Produced at Lake City Army Ammunition Plant.
• Cartridge, Caliber 7.62mm, NATO, Duplex, M198 (United States): 7.62x51mm NATO duplex round with two 84-grain bullets. The developmental designation was T314E3.
• Cartridge, Caliber 7.62mm, NATO, Tracer, M276 (United States): 7.62x51mm NATO so-called "Dim Tracer" with reduced effect primarily for use with night vision devices, green cartridge tip with pink ring.
• Cartridge, Caliber 7.62mm, NATO, Match, M852 (United States): 168-grain 7.62x51mm NATO Hollow-Point Boat-Tail cartridge, specifically designed for use in National Match competitions, later approved by US Army JAG for combat use by snipers.
• Cartridge, Caliber 7.62mm, NATO, Saboted Light Armor Penetrator (SLAP), M948 (United States): 7.62x51mm NATO Saboted Light Armor Penetrator cartridge.
• Cartridge, Caliber 7.62mm, NATO, Armor Piercing, M993 (United States): 126.6-grain 7.62x51mm NATO armor piercing round, black cartridge tip.

See also

• 7.62 mm caliber
• .276 Pedersen
• Caliber conversion sleeve
• NATO EPVAT testing
• STANAG (Standardization Agreements of NATO)
• List of rifle cartridges

There are many cartridges which use 7. ... En-Block clip loaded with 10 rounds of . ... A 32 ACP FMJ cartridge, a 32 ACP FMJ cartridge in a blued . ... STANAG is the NATO abbreviation for Standardization Agreement, which set up processes, procedures, terms and conditions for common military or technical procedures between the member countries of the alliance. ... This article is about the military alliance. ... Left to Right: .17 HM2, .17 HMR, .22LR, .22 WMR, .17 SMc, 5mm/35 SMc, .22 Hornet, .223 Remington, .223 WSSM, .243 Winchester, .243 Winchester Improved (Ackley), .25-06, .270 Winchester, .308, .30-06, .45-70 Govt, .50-90 Sharps From left to right: .50 BMG, 300 Win Mag, .308...

References

External links

• Various photos of 7.62x51 NATO ammunition