The question of what kind of cartridges are used in a Kalashnikov assault rifle often causes confusion among those who are just beginning to get acquainted with small arms or are interested in military history. The machine, known throughout the world as AK-47, became a symbol of an entire era and still remains the standard of reliability in extreme operating conditions. However, to understand its effectiveness, it is necessary to disassemble in detail the ammunition that makes this mechanism work flawlessly.
The main ammunition for this system is an intermediate caliber cartridge, designed specifically to provide a balance between firing range, penetration and controllability of the weapon during automatic fire. Unlike the rifle cartridges that were standard during World War II, this ammunition allowed for the creation of compact and lightweight weapons, effective at distances of up to 300-400 meters. It was this factor that became the key in the mass adoption of the machine gun by the armies of dozens of countries.
In this material we will take a detailed look at the technical characteristics of standard ammunition, analyze its design features and answer frequently asked questions about compatibility with other modifications of the Kalashnikov family. Understanding the specifics of the cartridge is necessary not only for theorists, but also for practitioners involved in maintenance, storage or historical reconstruction.
Main caliber and ammunition markings
The standard cartridge for the AK-47 assault rifle is 7.62 mm ammunition with a case length of 39 mm. In professional nomenclature it is designated as 7.62×39 mm. This size became the standard for Soviet and post-Soviet small arms, as well as for many foreign copies. It is important to understand that the number “7.62” is conditional and indicates the diameter of the bullet along the rifling fields, while the actual diameter of the bullet may vary slightly depending on the manufacturer and year of manufacture.
In the Western classification, this cartridge is often called .30 Russian Short or just 7.62 Soviet, which emphasizes its origin and difference from the more powerful 7.62x54 mm R rifle cartridge, which is used in machine guns and sniper rifles. It is absolutely impossible to confuse these two types of ammunition, since they are not interchangeable and have fundamentally different dimensions and ballistic properties. The 7.62x39mm cartridge case has a conical shape, which facilitates extraction after firing, especially in dirty conditions.
⚠️ Attention: Never try to load a machine gun with cartridges of a different caliber, even if they visually seem suitable. The use of non-standard ammunition can result in barrel rupture, damage to the bolt group and serious injury to the shooter.
Markings on the boxes and the cartridges themselves allow you to quickly identify the type of bullet. Typically, the bullet core is colored or varnished. For example, green coloring often indicates an armor-piercing or tracer compound, while a regular steel bullet may not have color markings or be coated with varnish. Knowledge of these designations is critical for the correct selection of ammunition for specific tasks.
When storing 7.62x39 mm cartridges for a long time in high humidity conditions, it is recommended to regularly check the condition of the varnish coating of the cartridge case, as damage to it can lead to corrosion and failure of the weapon.
Design features of the cartridge case and powder charge
The 7.62x39 mm cartridge case is made of steel coated with tombak or varnish, which is a distinctive feature of the Soviet and Russian school of ammunition production. Brass sleeves are also found, especially in foreign-made cartridges or in collection samples, but it was the steel sleeve that ensured mass production and low cost. Steel is stronger than brass, but requires a high-quality protective coating to prevent corrosion and ensure smooth chambering of the cartridge.
The shape of the sleeve has a pronounced taper, the angle of which is about 0 degrees 55 minutes. This geometry was not chosen by chance: it allows the powder gases to effectively push the bullet out, and after firing the cartridge case is easier to remove from the chamber, even if the weapon is heavily contaminated. Inside the sleeve is powder charge, which in modern samples consists of nitrocellulose powders, providing stable combustion and the necessary pressure.
The pressure in the bore during a shot reaches significant values, about 2800 atmospheres, but the design of the machine gun and the properties of the gunpowder make it possible to dampen sudden surges. The igniter primer is located in the center of the case bottom (central ignition) and is reliably protected from punctures due to careless handling. For ignition, mercury fulminate or more modern non-flammable compounds are used, which are less aggressive to the metal of the weapon.
Why is the sleeve steel?
The use of steel instead of brass was dictated by strategic necessity. Copper and zinc are scarce non-ferrous metals needed for the electrical industry. Steel was produced in huge quantities, which made it possible to create millions of cartridges without harming other sectors of the economy.
An important element is the bottom of the sleeve, which has a groove for hooking the ejector. The quality of processing of this part directly affects the reliability of removing the spent cartridge case. When using cartridges with defective bases (for example, with a deformed groove), delays may occur during shooting, requiring the shooter's intervention to reload.
Types of bullets and their ballistic characteristics
The range of bullets for the 7.62x39 mm cartridge is extremely wide and covers tasks from target practice to hitting lightly armored targets. The basic bullet is a steel core bullet that is capable of penetrating a brick wall or steel helmet at medium ranges. However, other options have been developed for specific tasks, each of which has its own unique properties.
Among the main types of bullets found in ammunition are:
- 🔴 Ordinary bullet - has a steel core covered with a lead jacket and a tombak shell, designed to defeat manpower.
- 🟢 Tracer bullet — has a composition that ignites when fired and burns in flight, which allows you to adjust the fire and indicate targets; painted green or red.
- ⚫ Armor-piercing incendiary bullet - designed to destroy targets protected by light armored barriers and ignite flammable materials.
- 🟡 Reduced rebound — a special bullet with a modified nose geometry to reduce the likelihood of ricochet when firing at water or ground.
The ballistic characteristics of the cartridge provide an initial bullet velocity in the range of 710–730 meters per second (for a standard charge). At a distance of 100 meters, the bullet retains high penetrating ability, and at a distance of 300 meters its energy is still sufficient to guarantee destruction of manpower. The bullet's flight path is relatively flat at distances up to 200 meters, which simplifies aiming in battle.
It is important to note that the accuracy of fire depends not only on the quality of the cartridge, but also on the condition of the barrel bore. Worn rifling or the presence of carbon deposits can significantly reduce the accuracy of a hit, especially when firing in bursts. Therefore, for sniper or high-precision shooting, cartridges with increased accuracy are used, which undergo more stringent quality control during production.
Compatibility: AK-47, AKM and other modifications
One of the main advantages of the Kalashnikov platform is the high degree of uniformity of ammunition. The 7.62×39 mm cartridge is used not only in the very first AK-47, but also in its modernized version AKM, as well as in light machine guns PKK and RPK-74 (before switching to 5.45 mm caliber). This means that magazines and ammunition are completely interchangeable between these weapons.
However, there are nuances associated with the material of the store. Early magazines for the AK-47 were made of stamped steel and were heavier, while lightweight aluminum and later plastic magazines were introduced for the AKM. Despite the difference in material, the geometry of the connecting dimensions and the cartridge feed into the chamber remained unchanged. This allows modern polymer-coated magazines to be used in older machines and vice versa.
The table below demonstrates the main differences in the compatibility of various modifications of weapons with the 7.62x39 mm cartridge:
| Weapon model | Years of production | Store type | Compatible with 7.62x39 |
|---|---|---|---|
| AK-47 (1st type) | 1947–1949 | Steel stamped | Full |
| AK-47 (3rd type) | 1951–1959 | Steel milled | Full |
| AKM/AKMS | 1959–present | Aluminum / Plastic | Full |
| RPK (light machine gun) | 1961–present | Enlarged (40 cartridges) | Full |
| SKS (Self-loading carbine) | 1945–present | Fixed (10 cartridges) | Full |
It is also worth mentioning the existence of foreign copies, such as Chinese Type 56 or Polish PMK. They all use the same 7.62x39mm cartridge. However, in some cases, especially when using cartridges of poor quality or with defects in geometry, there may be problems with feeding in magazines of a particular manufacturer. Therefore, for competitions or critical tasks, it is recommended to select cartridges and magazines from the same brand.
⚠️ Attention: Although cartridges are interchangeable, cartridges containing bimetallic or corrosive metal should not be used for sporting purposes.