The question is what caliber does the legendary shoot? AK-47, is often the subject of heated debate among firearms enthusiasts, historians and collectors. Many people mistakenly believe that we are talking exclusively about 5.45 mm or 5.56 mm cartridges, confusing various modifications of Soviet and foreign weapons. In fact, the classic Kalashnikov assault rifle, adopted in 1949, was designed for a specific intermediate cartridge, which became the standard for the Warsaw Pact countries for many decades.
Understanding caliber is not just knowing the number written on the box, but also understanding how this characteristic affects the bullet's stopping power, flight path and penetration ability. Caliber 7.62 mm provided the new weapon with the necessary power to defeat enemy personnel protected by body armor of that time, as well as the ability to penetrate light cover. It was this parameter that laid the foundation for the phenomenal reliability and efficiency of the Kalashnikov system in the most severe climatic conditions.
In this article we will analyze in detail the technical characteristics of the cartridge used in AK-47, let's look at its differences from later modifications and answer frequently asked questions. You will learn why this ammunition is still produced in huge quantities and what physical processes occur inside the barrel when fired. The information will be useful both for novice shooters and for those interested in the history of the development of small arms.
Main caliber and cartridge type
The fundamental answer to the question of caliber is the number 7.62 mm. However, for complete technical accuracy it is necessary to use the full designation of the ammunition, which is 7.62×39 mm. The first number indicates the diameter of the bullet, and the second indicates the length of the cartridge case in millimeters. It is the ratio of these parameters that determines the ballistic properties and scope of use of the weapon. Automatic AK-47 (index 56-A-212) was created specifically for this cartridge, which in the West is often called 7.62 Soviet.
Historically, the transition to an intermediate cartridge was a revolutionary step in military affairs. Before the appearance AK-47 The armies of the world used either powerful rifle cartridges (like 7.62x54mm R), which provided long-range shooting but had heavy recoil, or pistol cartridges for submachine guns, which were effective only at close range. Cartridge 7.62×39 mm took the golden mean: it made it possible to conduct effective fire at distances of up to 400 meters, while maintaining the controllability of the weapon during automatic firing.
When purchasing cartridges, always pay attention to the year of manufacture and manufacturer markings, as old stocks may have altered powder characteristics or corrosion of the primer.
It is important to note that the term "caliber" can be interpreted differently in different countries. In Russia and the post-Soviet countries, caliber is often measured by the rifling fields, while in the NATO system it is measured by the diameter of the bullet itself (grotage). That's why American .308 Winchester actually corresponds to our 7.62 mm, but has different case sizes and powder gas pressure. For AK-47 It is critical to use cartridges with a 39 mm case length, since cartridges with a longer case (for example, 54 mm) simply will not enter the chamber, and shorter ones can cause delays when firing.
Design features of the 7.62×39 cartridge
The cartridge for which it was created AK-47, has a conical shape of the cartridge case, which contributes to more reliable extraction of the spent cartridge case after the shot. This engineering solution became one of the key factors in the legendary reliability of the Kalashnikov assault rifle. The taper of the cartridge case reduces the area of contact with the walls of the chamber, reducing the risk of jamming even when the mechanism is heavily contaminated or low-quality fuel (gunpowder) is used.
Cartridge bullet 7.62×39 mm usually has a steel core coated with tombak or varnish, and a bimetallic shell. This design provides high penetration capacity. The weight of a standard bullet is about 7.9 grams, although there are modifications with heavier bullets or with a changed center of mass. The initial speed of the bullet when leaving the barrel AK-47 (barrel length 415 mm) is approximately 710 meters per second.
- 🎯 Bullet types: There are various modifications of cartridges, including ordinary (with a steel core), tracer (for fire adjustment), armor-piercing incendiary and bullets with reduced ricocheting ability.
- ⚙️ Capsule: In cartridges for AK-47 uses a “Zhevelo” type capsule or its analogues, which ensure reliable ignition of the powder charge even at low temperatures.
- 💣 Gunpowder: It uses nitrocellulose powder, which burns at a certain rate, allowing a heavy bullet to be accelerated to high speeds without creating excess pressure in the barrel.
It is worth mentioning that there are also cartridges with bullet with a shifted center of gravity (for example, M43 or its Soviet analogues), which, when they hit soft tissue, begin to tumble, causing severe injuries. However, the basic ammunition for civilian and military use remains the cartridge with a conventional steel core bullet. The accuracy of the manufacture of cartridges directly affects the accuracy of the battle: factory cartridges provide dispersion of about 15 cm at a distance of 100 meters, while cartridges with increased accuracy can improve this indicator.
Ballistic characteristics table
For a deep understanding of the capabilities of weapons firing a cartridge 7.62×39 mm, you need to turn to dry numbers. Ballistic data allows us to evaluate the effectiveness of weapons at various distances. Below is a table showing the change in speed, energy and trajectory of a bullet when fired from a standard machine gun with a barrel length of 415 mm.
| Distance (m) | Bullet speed (m/s) | Bullet energy (J) | Exceeding trajectory (cm) |
|---|---|---|---|
| 0 (muzzle) | 710 | 2000 | - |
| 100 | 630 | 1580 | +12 |
| 200 | 560 | 1250 | +18 |
| 300 | 495 | 980 | +15 |
| 400 | 440 | 770 | 0 |
Analyzing the table data, you can see that at a distance of 400 meters the bullet retains energy of about 770 Joules, which is quite enough to destroy manpower. However, at a distance of over 300 meters, a decrease in speed and an increase in flight time begin to affect, which requires significant corrections when aiming. Muzzle energy at 2000 J is optimal for an intermediate cartridge, providing a balance between penetration and recoil.
It is important to consider that actual performance may vary depending on air temperature, altitude and the specific weapon. Wear of the barrel bore also makes its own adjustments: in a heavily worn AK-47 the initial velocity of the bullet may be lower than the rated speed, which will lead to a decrease in accuracy and penetration at extreme distances.
⚠️ Attention: The ballistic data given are averaged for standard shooting conditions. The actual trajectory of a bullet depends on many factors, including barometric pressure, wind and powder temperature. Do not use these figures for accurate calculations of shooting at extreme distances without practical zeroing of a specific weapon.
Comparison of AK-47 and AKM: is there a difference in cartridges?
One of the most common questions among gun enthusiasts is: are cartridges different? AK-47 and its modernized version AKM? The answer is clear: no, both machines use the same cartridge 7.62×39 mm. However, there are nuances in the design of the weapon that affect the ballistics and accuracy of the battle, although the ammunition itself remains unchanged.
AKM (Modernized Kalashnikov Avtomat), adopted for service in 1959, received a number of improvements aimed at reducing weight and improving manufacturability. One of the key changes was a compensator-flame arrester at the muzzle, which partially compensated for the upward movement of the bullet during automatic shooting. In addition, in AKM a trigger retarder was introduced, which increased the accuracy of burst fire. These changes did not require changing the cartridge, but improved the efficiency of its use.
What is the main difference between AK-47 and AKM?
The main difference lies in the manufacturing technology of the receiver (stamping instead of milling), the presence of a compensator on the AKM muzzle and a modified sighting mechanism. The cartridge remained the same - 7.62x39 mm.
There is a common misconception that AKM shoots some kind of “improved” cartridge. In fact, the modernization affected precisely the mechanics of the weapon. Cartridge 7.62×39 mm remained the main one until the early 1970s, when it was replaced by a low-pulse cartridge 5.45×39 mm for vending machines AK-74. The transition to a smaller caliber was due to the desire to increase the soldier’s wearable ammunition and improve the accuracy of fire at medium distances, but this is already the story of the next generation of weapons.
- 🔫 Identity: Stores from AK-47 and AKM completely interchangeable, since the geometry of the cartridge has not changed.
- 📉 Recoil: Thanks to the compensator AKM The felt recoil when firing the same cartridge has become a little softer and more manageable.
- 🎯 Accuracy: Improving the quality of manufacture of barrels and mechanisms in AKM made it possible to better reveal the potential of the 7.62x39 mm cartridge.
Myths about caliber and real facts
Around AK-47 and his patron there are many myths generated by cinema and computer games. One of the most persistent myths is that a 7.62 mm bullet, when it hits a person, “rips out pieces of meat” or creates huge exit holes. In reality, a bullet with a steel core, passing through soft tissue, often leaves neat entry and exit holes if it does not encounter bone in its path. The "explosive bullet" effect is typical for high-velocity low-pulse cartridges or special expansive bullets that are not standard for AK-47.
Another common myth concerns the "impenetrability" of armor. It is believed that 7.62×39 mm penetrates any body armor. This is not entirely true. Modern body armor of protection classes 3A and higher (according to Russian GOST or NIJ III) successfully withstand the impact of a conventional bullet of this caliber. To penetrate ceramic plates, special armor-piercing cartridges with a tungsten carbide core are required, which are not mass-produced.
The real effectiveness of the 7.62x39 mm cartridge lies not in the mythical “explosive” force, but in the combination of good penetration, high reliability and the ability to fire effectively in difficult conditions.
There is also an opinion that the 7.62 mm cartridge is too powerful for shooting training. In practice, this particular caliber is considered optimal for initial training, since it forgives some errors in preparation and aiming due to its trajectory and energy. However, the strong recoil and noise of the shot can be intimidating for beginners, so for the first training they often use weapons of smaller calibers.
⚠️ Attention: Using expired ammunition or stored in improper conditions (high humidity, temperature changes) can result in incomplete combustion of the powder, bullet failure, or, in rare cases, barrel rupture. Always visually inspect ammunition before loading.
Current status and application
Despite the fact that the army of Russia and many other countries switched to the caliber 5.45 mm, cartridge 7.62×39 mm is not going to fade into history. It remains the main one for a huge number of armies in Asia, Africa and the Middle East. In addition, this caliber is extremely popular in the civilian sector: hunting for medium and large animals, sport shooting and self-defense are the main niches for its use today.
The industry continues to produce new modifications of cartridges. Bullets with increased stopping power and subsonic cartridges for shooting with a silencer appeared (although for AK-47 this is less relevant due to gas automatics), and high-precision cartridges for sports modifications AKM. The civilian arms market in the US and Europe is also experiencing huge demand for this caliber, which stimulates production.
☑️ Checking cartridges before shooting
In conclusion, it is worth noting that AK-47 and his patron 7.62×39 mm became a symbol of an entire era. These weapons and ammunition have proven their viability in dozens of conflicts around the world. Understanding what caliber a machine gun fires helps to better assess its tactical and technical characteristics and place in the history of small arms. Reliability, simplicity and sufficient power make this combination relevant in the 21st century.
Can an AK-47 fire 5.45 mm ammunition?
Absolutely not. The cartridges have different bullet diameters (7.62 vs. 5.45 mm) and different case lengths. The 5.45 mm cartridge will simply fall into the chamber or get stuck, and the shot will occur in the bore, which will lead to swelling or rupture of the barrel and serious injury to the shooter.
What is the maximum effective firing range of an AK-47?
The effective firing range of single shots is up to 400 meters. When firing in bursts, the effective range is reduced to 150-200 meters due to the high dispersion of bullets. The maximum flight range of a bullet reaches 3000 meters, but hitting the target at such a distance is almost impossible.
Why is the 7.62×39 cartridge called intermediate?
It is called intermediate because it ranks in power between pistol cartridges (used in SMGs) and full-size rifle cartridges (used in rifles and machine guns). This allows you to create lightweight automatic weapons with acceptable recoil.
Is there a difference between 7.62x39 and 7.62x54R cartridges?
Yes, these are completely different cartridges. The 7.62x54R (rifle) has a longer case (54mm vs. 39mm), more power, energy, and range. They are not interchangeable and are intended for different classes of weapons (machine guns versus machine guns and sniper rifles).