The question of what is the real bullet-speedIt is one of the most discussed in circles interested in modern rifle technology. The 12th model Kalashnikov, which replaced the legendary AK-74M, is positioned as a deep modernization aimed at improving the accuracy, ergonomics and accuracy of combat. However, it is the ballistic efficiency, directly dependent on the initial velocity of the projectile flying out of the barrel, remains the fundamental parameter that determines the striking ability of the complex as a whole.
Many people mistakenly believe that switching to a new weapon dramatically changes the physical nature of the shot, but this is not entirely true. 5.45mm roundThe sensing system used in the machine remained the same (7H39, 7H40, BZ), which dictates its limitations and capabilities. However, changes in the barrel design, its length and production technology, as well as the introduction of a new muzzle-systemMake adjustments to the final indicators. Understanding these nuances is critical to assessing the real combat qualities of weapons.
In this article, we will discuss in detail what determines the speed of the bullet in the AK-12, how it changes at different distances and what factors can significantly affect the ballistic trajectory. We will move away from dry tabular data and consider the practical side of the issue, including the impact of weather conditions and the quality of ammunition. This will allow to form an objective idea of the capabilities of the new Russian machine.
Factors affecting the initial departure speed
The initial velocity of a bullet is not a fixed constant, but a variable variable that depends on a set of factors. In the context of AK-12 The key element determining this parameter is the length of the trunk and the quality of its channel. The standard barrel of the machine has a length of 415 mm, which is a compromise between maneuverability in urban conditions and the need to ensure the complete combustion of the powder charge. If the barrel was shorter, the speed would fall due to burns, if longer - would increase the parasitic mass and dimensions.
The second critical factor is the cartridge itself. Modern. 7N39 The bullet was designed to meet the requirements of a new generation of weapons. It provides a more stable fire rate and, as a result, a more predictable initial speed compared to the Soviet counterparts of the AK-74. However, even within a single batch of cartridges, the speed spread can be several meters per second, which is the norm for mass production.
⚠️ Note: The characteristics declared in the passport data (e.g. 900 m/s) are obtained under ideal laboratory conditions. In real use, especially at low temperatures or using high viscosity lubricants, the initial speed may decrease by 5-10% due to increased friction of the bullet against the barrel channel.
The third aspect is the wear of the channel of the trunk. For AK-12 The claimed resource of 20,000 shots to loss of accuracy, but the erosion of the cuts begins with the first volleys. As the powder gases burn out and the mechanical abrasion of the fields of the cuts, the gases begin to break through faster, which reduces the effectiveness of dispersing the bullet. Therefore, the speed of the bullet on the new machine and on the weapon with a shot of 15 thousand rounds will differ.
- 🎯 Bore length: Determines the time of exposure of powder gases to the bottom of the bullet.
- 💊 Type of cartridge: The chemical composition of gunpowder and the mass of the bullet directly affect the pressure in the channel.
- 🌡️ Temperature: Cold powder burns more slowly, reducing pressure and initial speed.
- 🛠️ Status of the barrel: Pollution with soda or wear of cuts changes ballistics.
Comparison of ballistics AK-12 and AK-74M
When comparing new AK-12 predecessor AK-74M The question often arises: is there a real increase in speed? Formally, the length of the barrel in both models is the same (415 mm), and the caliber is identical. However, engineers of the Kalashnikov concern claim to increase accuracy and stability of the battle. This is achieved not so much due to a sharp jump in the initial speed, but due to the improved accuracy of the trunks themselves and the new design of the muzzle device.
Muzzle compensator AK-12 has a different geometry of the holes, which allows more efficient removal of powder gases. This reduces the tossing of the barrel and, importantly for ballistics, minimizes the impact of the muzzle wave on the bullet at the time of its departure. While the AK-74M The bullet may experience slight disturbances due to the turbulence of the gases, and this process is optimized in the new model. As a result, even at similar initial speed, the actual speed at the muzzle slice and the stability of the flight of the AK-12 are higher.
It is also worth noting the application of AK-12 More advanced technologies for processing the channel trunk. Cold forging and chrome forging allow you to achieve a smoother surface, which reduces the resistance to the movement of the bullet. Less friction means that most of the energy of the powder gases is transferred to the kinetic energy of the projectile, rather than being lost to overcome the friction force. This gives a small but statistically significant increase of 10-15 m/s compared to the average worn-out AK-74M.
The effect of attachment equipment on speed
Installation of a silencer (PBS) on the AK-12 significantly changes ballistics. The bullet passes through the volume of the navel, losing speed due to the resistance of the medium inside the device and possible engagement with the fairing. Losses can range from 30 to 60 m/s depending on the design of the PBS.
Table of ballistic characteristics at distance
To understand how a bullet behaves in flight, it is not enough to know only the initial speed. A critical parameter is the conservation of energy and speed at different distances. Below are the averaged data for the 7H39 cartridge issued from AK-12. These numbers show how quickly a bullet loses speed due to air resistance.
| Distance (m) | Speed (m/s) | Energy (J) | Deflection of trajectory (cm) |
|---|---|---|---|
| 0 (mullet slice) | 900 | 1430 | 0 |
| 100 | 765 | 1050 | +2.5 |
| 300 | 550 | 620 | -25.0 |
| 500 | 380 | 310 | -95.0 |
As can be seen from the table, to a distance of 500 meters, the speed of the bullet drops more than twice. At this frontier kinetic It is still sufficient to penetrate the standard army helmet and BR4 protection class body armor, but the penetration capacity is drastically reduced. This is why the effective range of single shots is used for AK-12 It is limited to 500-600 meters, although the target range can be set higher.
It is important to note that the data in the table are relevant for standard atmospheric conditions. Changes in air density, humidity and wind make adjustments. For example, when shooting in the mountains, where the air is rarefied, the speed of the bullet at long distances will fall more slowly, and lineage It'll improve. In hot and humid climates, air resistance increases, and the bullet loses energy faster.
When shooting AK-12, use cartridges from one batch. The difference in initial speed between different batches can lead to a displacement of the average hit point (STP) by 10-15 cm at a distance of 300 meters.
Effect of bullet type on speed indicators
Not all 5.45mm bullets are the same. In the nomenclature of ammunition for AK-12 Different types of bullets are used, each with its own mass and aerodynamic properties. A standard steel-core bullet (7H6, 7H39) has a mass of about 3.4 grams. It has the best balance between initial speed and penetration at medium distances.
Armour-piercing incendiary bullets (BZ) or bullets with reduced ricochet power may have slightly different mass and shape of the head. Heavier bullets used in some specialized cartridges will have a lower initial speed at the same charge of gunpowder, but better retain energy at a distance. This is a classic compromise of ballistics: heavier than a bullet - lower speed at the muzzle, but higher inertia in flight.
The cartridges are in the house. tracer. The presence of tracers in the bottom of the bullet changes its center of gravity and aerodynamics. Such bullets are often less dense and can lose speed faster. In addition, the burning of the tracer composition creates additional resistance. In the case of tracer ammunition, The AK-12 needs to be adjusted for the aiming, as the trajectory will be steeper.
- 🔩 Steel core: Provides high hardness and penetration, standard weight.
- 🔥 Trace train: Increases the sailing of the bullet, reducing the speed at a distance.
- 🛡️ Armour-piercing core: It is often made from heavier alloys, which affects the initial speed.
- 💥 Blow-up bullet: It has a cavity in the nose, which worsens aerodynamics compared to pointed analogues.
The practical importance of speed for shooting
For a shooter using AK-12 In real-world conditions, high-speed bullets have several practical applications. First of all, it's flight time. The higher the speed, the less time it takes the bullet to cover the distance to the target. At a distance of 300 meters, the difference in speed of 50 m / s can be several hundredths of a second. It seems small, but when shooting at a moving target or if you need to quickly transfer fire, this time becomes critical.
Second, the trajectory. A bullet flying at high speed describes a gentler arc. This makes aiming easier, as the shooter doesn’t need to make large vertical adjustments at different distances. In a stressful situation, a fighter can simply hold his sights in the center of the target at distances up to 300-350 meters, relying on the accuracy of the trajectory. AK-12, and still get into the kill zone.
⚠️ Note: Do not forget that the high speed of the bullet increases the likelihood of ricochet from hard surfaces (concrete, asphalt, stone). When shooting in urban areas or indoors, this creates an additional danger for the shooter and those nearby.
The third aspect is penetration. The kinetic energy of a bullet is proportional to the square of its velocity. Even a small increase in the initial speed gives a noticeable increase in energy on the trunk section. This allows you to more confidently penetrate light shelters, car doors or elements of protective equipment. For AK-12, oriented to modern combat missions, this parameter is one of the priorities.
☑️ Verification of ballistic conditions
Operational nuances and servicing of the barrel
So The AK-12 retained the declared ballistic characteristics, it is necessary to strictly monitor the condition of the barrel channel. The accumulation of sodium, especially when using corrosive capsules in cartridges, can lead to a slowing of the channel. Copper, settling on the fields of the cuts, narrows the caliber and changes the geometry of the bullet entry, which negatively affects speed and accuracy.
Regular cleaning and lubrication is not just a formality, but a necessity for the preservation of ballistics. However, balance is important here: an excess of thick lubrication in the barrel channel at low temperatures can create a “hydraulic impact” effect or simply increase the force pressure, which in rare cases can be dangerous, or, conversely, slow the bullet at the initial moment of movement. Use only the recommended ones gun-greaseadapted to climatic conditions of operation.
It is also worth mentioning the impact of the nozzle. The use of flame arresters, DTC or PBS by third-party manufacturers can significantly change the pressure in the barrel channel and, as a result, the speed of the bullet. If you set the AK-12 non-standard muzzle slice or adapter, be sure to conduct a control shooting to check the change in the STP and assess the real characteristics of the battle.
The stability of the initial bullet speed in the AK-12 is achieved by combining a high-quality barrel, a unified cartridge and an improved muzzle device, which in total gives an advantage over previous models in accuracy and penetrating ability.
Does the length of the barrel of the shortened versions of the AK-12 affect speed?
Yes, for modifications with a shortened barrel (for example, AK-12K or AKS-12U), the initial speed of the bullet will be lower. Reducing the length of the barrel leads to the fact that the bullet flies out before the entire powder charge has time to burn and transfer energy. Losses can range from 50 to 100 m / s depending on the degree of shortening, which significantly reduces the effective range of fire.
Can the bullet speed in the AK-12 be increased by tuning?
It is impossible to increase the speed without replacing the ammunition. Installation of a more powerful return spring will not give effect, but only increase the rate of shooting and wear. The only legal way is to use amplified-charge cartridges (if certified) or experiment with barrel length (which requires weapon conversion and deregistration). Standard tuning is aimed at ergonomics, not ballistics.
What is the maximum range of the AK-12 bullet?
The maximum range of the bullet 5.45 mm when shooting at an angle of 45 degrees can reach 3000-3200 meters. However, this distance is not of practical importance for aiming, since the bullet loses its killing power and accuracy. The effective range, where a guaranteed stop target is possible, is limited to 500-600 meters.
Does the speed depend on the batch of bullets?
Yes, the spread of initial speed between different batches of ammunition is normal. The tolerances for powder charge mass and pressing density may vary. For sniper shooting or shooting weapons, it is recommended to use cartridges of one batch and one year of release to minimize the impact of this factor on the STP.