5.56x45 vs. 7.62x39: Which Is Better?

By Wes Littlefield

Last Updated: Jul 14, 2026

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Wes Littlefield

Guns have fascinated Wes since pulling the trigger on his BB gun as a kid. He built a private gun range over a decade ago to keep his skills sharp. He loves breaking down complex ideas into understandable pieces for readers, with expertise in hunting and all aspects of shooting.

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Wes Littlefield, "5.56x45 vs 7.62x39 - Rifle Caliber Comparison by Ammo.com"
(https://ammo.com/comparison/556-vs-762)

When it comes to selecting a semi-automatic rifle cartridge, the 5.56x45mm NATO and 7.62x39mm are always front and center in the conversation.

Both rifle rounds have been forged in the fires of battle in Vietnam, Iraq, and Afghanistan, as well as a host of other conflicts across the globe. As a result, they are two of the most popular rifle cartridges on the planet.

Virtually every military on Earth uses one of these two rifle rounds for their primary battle rifle. And there's a good reason for that. Their terminal ballistics and effectiveness in close quarters battle (CQB) are second to none.

But which rifle cartridge is better suited for you – and does it matter?

Let's take a closer look at the caliber debate that has defined world conflict since the Cold War: 5.56x45mm NATO vs. 7.62x39mm.

A Note on Nomenclature: 223 Remington vs. 5.56 NATO

Please note that within this article we refer to the 223 Remington (223 Rem) and the 5.56x45mm NATO interchangeably. There are differences between the two. You can read about them in our 223 Rem vs. 5.56 NATO comparison.

In short, a 223 Rem can be safely fired from a rifle or handgun chambered in 5.56; however, the reverse is not true.

When 5.56 Is the Better Choice

• Varmint hunting
• Dynamic shooting competitions
• Home defense

When 7.62x39 Is the Better Choice

• Deer and hog hunting
• Need more stopping power
• Unbeatable reliability of the AK platform

5.56 vs. 7.62x39: Let the Caliber Cold War Begin

Ever since the Vietnam War, when the 5.56 and 7.62x39mm first squared off toe to toe, many militaries around the world have adopted one of the rifle cartridges as the chambering for their primary battle rifle. This has led many internet gun forums to delve into intense heated debates over the combat effectiveness and lethality of each round to determine which one is "best." Most of these caliber debates come down to terminal ballistics, effective range, stopping power (ft-lbs), muzzle velocity (fps), accuracy, and bullet weight.

In one camp, we have the 7.62x39 comrades with their AK-47 rifles, SKS rifles, AKM variants, and RPK machine guns. They tout the 7.62x39 as firing a heavier bullet that boasts the kinetic energy equivalent to Thor's hammer, superior barrier penetration, and enough stopping power to put a Siberian brown bear into permanent hibernation.

In the other camp are the proponents of the 5.56 NATO cartridge with their beloved AR platform, M4 carbine, and bolt-action varmint rifles. These shooters proclaim that "speed kills" and a lighter bullet traveling at high muzzle velocity is preferable because it causes massive damage via hydrostatic shock. With their round's flatter trajectory and lower recoil, 5.56 shooters proudly boast of sniper-rifle accuracy at ranges that the slow and chunky 7.62x39 crowd could only dream of.

I hope you enjoyed some of the sarcasm there. But sadly, this is what the caliber debate has come to in some forums.

Let's begin by analyzing the specs for each cartridge.

Cartridge Specs

When evaluating two rifle rounds, it's good practice to compare their specs. And although the 5.56 and 7.62x39 are very different from one another, there are some nuances that we can evaluate from the spec chart.

The first major difference is the bullet diameter of each cartridge. The 5.56 fires a 0.224" diameter bullet, while the 7.62x39's is 0.312".

One quirk of Russian nomenclature confuses some new shooters. The 7.62x39 does not fire a 7.62mm (0.308") diameter bullet like the 7.62x51 NATO (308 Winchester). Instead, it fires a 0.312" diameter bullet like the 303 British cartridge. This indicates that the 7.62x39 fires a heavier bullet at a lower muzzle velocity, while the 5.56 fires a smaller bullet at a higher muzzle velocity.

The wider base diameter of the 7.62 allows for more case capacity than the 5.56, which is needed to push those heavier caliber bullets at an acceptable velocity to be effective at longer ranges. On the other hand, the 5.56 has a longer overall length. It has a thinner, longer case, while the 7.62's case is shorter and wider.

The last major difference is the maximum pressure. The 5.56 generates higher pressure in the chamber to produce the higher velocities it needs to be combat-effective, whereas the 7.62x39 can get by with lower pressures.

Now that we have a clearer understanding of the cartridge specs, let's talk about recoil.

Recoil

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Both the 5.56 and 7.62 have very low recoil when compared to larger rounds like the 308 Winchester, 30-06 Springfield, and 7.62x54R.

Recoil is a function of bullet weight, propellant charge weight, velocity, and firearm weight. All other things being equal, a heavier bullet with a heavier powder charge will recoil more than a lighter bullet with a lighter powder charge.

A 7.62x39 typically fires a 123 grain bullet, while the 5.56 NATO cartridge typically fires a 55 or 62 grain bullet (although heavier bullets are also used).

Assuming a 7-pound rifle, the 7.62x39 generates approximately 8.5 ft-lbs of free recoil, compared to 5 ft-lbs for the 5.56 NATO. This is not surprising, as the 5.56 fires a considerably lighter bullet (albeit at higher muzzle velocity) than the 7.62x39. Want to know more about the best 5.56 grain options? Check out our detailed guide for the best recommendations tailored to your shooting style and needs.

Now it's true that the 5.56 has less recoil, and this is preferred, but the recoil from the 7.62 is not oppressive by any stretch of the imagination. Shooters should not experience much recoil with either round. Both are very pleasant to shoot.

One major difference when it comes to recoil is between semi-auto and full-auto fire (aka "the happy switch"). In the case of fully automatic fire, there is a noticeable difference between the two rifle rounds. The heavier recoil of the 7.62 will make it more difficult to control during full auto compared to the 5.56.

I know because I've fired both!

Now, for mounted machine guns or those using a bipod, such as the RPK or the M249 SAW, there will be little difference in full auto as the mount or bipod will help mitigate muzzle rise.

However, when it comes to muzzle rise while firing an assault rifle, the M4 carbine and 5.56 NATO cartridge are easier to control.

The short-stroke gas piston, lack of a recoil buffer, and overall heavier recoil of the AK-47 lend themselves to greater muzzle rise during automatic fire. Although it's not impossible to control the 7.62x39 in full auto, it takes more practice, training, and strength to keep the muzzle down compared to the M4 carbine.

Trajectory

Trajectory is how we quantify a bullet's flight path to its target, measured in inches of bullet drop. A flatter trajectory is preferred as it requires less sight adjustment and provides a longer effective range.

Muzzle velocity affects trajectory, since a bullet moving at high velocity gives gravity less time to affect its flight path. And when it comes to muzzle velocity and trajectory, the 223 Rem leaves the 7.62x39 in its dust.

Looking at the ballistic tables below, you can see how much flatter the 5.56 shoots compared to the 7.62.

At 400 yards, you can see that the 5.56 NATO's 55 grain bullet drops about 23" compared to over 44" for the 7.62x39. That's virtually a twofold difference.

The 5.56 NATO cartridge was designed to be effective in both long- and short-range engagements. The lightweight, super high-velocity 55 and 62 grain bullets used by the U.S. military are extremely effective at both.

Although the 7.62x39 can still be effective at range, it requires considerable sight adjustment to compensate for its massive bullet drop beyond 300 yards.

In terms of trajectory, the 5.56 NATO cartridge is undoubtedly the flatter-shooting round.

Accuracy

The 7.62x39 has gotten somewhat of a bad rap as being an inaccurate round. Some of this is likely due to inconsistencies in the ammo itself, and the rest is inherent to the AK platform specifically.

Former Communist Bloc manufacturing processes were not exactly ISO 9001 certified, if you catch my drift. Therefore, sometimes inconsistencies in powder charge or bullet seating depth of 7.62x39 ammo have been observed, and these differences between rounds will affect the point of impact. Reliability is always important in a battle rifle, and the AK platform is known for its undying reliability. However, to achieve this, the AK was designed with looser tolerances (especially in the chamber), and this often leads to decreased accuracy. Furthermore, the majority of 7.62 cartridges are steel-cased, which does not allow the case to form to the chamber during firing.

To learn more, check out our guide to steel vs. brass ammo.

But what about newly manufactured 7.62 ammo?

Newly produced 7.62x39 ammunition is considerably more consistent than its surplus predecessor from the spam can. However, most of your cheap steel-cased ammo is not going to be match grade; even the more expensive 7.62x39 will not compare with the consistency of 5.56 ammo. With optimized handloads for 7.62x39, I suspect that MOA-level accuracy could be obtainable for a solid marksman. However, most off-the-shelf 5.56 cartridges will be more consistent and accurate than 7.62x39.

Ballistic Coefficient

Ballistic coefficient (BC) is a numerical measure of how well a bullet overcomes frontal air resistance. It's a measure of how aerodynamic a bullet is. A higher BC is preferable, as it means the bullet will cut through the wind more easily.

The method for calculating BC is rather complicated and irrelevant for this article; however, heavier bullets typically have a higher BC. You would logically theorize that the 7.62x39 would dominate in terms of BC as it fires a heavier bullet … but this isn't the case.

Its design also plays a role in determining BC, and shorter, chunkier 0.312" diameter 7.62 bullets are not the most aerodynamic. As such, the 5.56 slightly edges out the 7.62 in terms of BC. On average, 5.56 has a G1 BC of 0.290, while the 7.62 has a G1 BC of 0.270. It's not a huge difference, but the 5.56 is slightly more resistant to wind drift.

Sectional Density

SD is calculated by comparing the bullet's weight and diameter. The greater the number, the greater the bullet's potential for penetration.

A 123 grain 7.62x39 bullet (the most common) has an SD of 0.182. A 55 grain 5.56x45 bullet (the most common) has an SD of 0.157.

7.62x39 bullets will generally have a higher SD than 5.56x45 bullets because they're heavier, but the 5.56 has a great SD, considering how lightweight the bullets are.

Hunting

Although both rifle rounds are designed for battle, they have become popular for hunting as well.

Varmint Hunting

The 223 Remington/5.56 NATO has long been considered a varmint round, and is extremely effective on small game such as groundhogs, prairie dogs, coyotes, and foxes.

Deer & Hog Hunting

Although the 5.56 is extremely effective on two-legged varmints, it is typically not considered a proper round for whitetail. Many states and provinces in North America allow a minimum bullet diameter for deer hunting: typically 0.243". This relegates the 5.56 to small game and varmint hunting only.

The 7.62x39 is more suitable for deer, feral hogs, and other medium game. Its heavier 123 grain bullet's 1,500 ft-lbs muzzle energy indicates that it is more than enough to take a deer out to around 150 yards. Hollow point and soft point bullets are loaded in 7.62x39, and provide appropriate terminal ballistics to take game humanely.

To summarize, the 5.56's lightweight bullets, flatter trajectory, and long-range capability make it an excellent hunting round for varmints and small game. The 7.62x39 is an excellent choice for taking deer and medium game within 150 yards, provided you are firing a proper expanding hollow point or soft point bullet.

Self Defense/Home Defense

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The 7.62x39 is renowned for its stopping power, delivering a punishing amount of kinetic energy to its target. In a short-range or CQB context, it's hard to debate that the terminal ballistics offered by the 7.62 are nothing short of spectacular. Therefore, many ranchers and farmers will carry a 7.62 rifle like the Ruger Mini-30 or SKS in their truck to dispatch predators or defend their property.

In contrast, the 5.56 offers lower recoil, higher muzzle velocity, and a flatter trajectory at the cost of less muzzle energy. However, as most self-defense conflicts occur under 100 yards, this gives the advantage to the 7.62x39.

But let's be honest: unless you live in the country, you're unlikely to use your semi-automatic rifle during a self-defense situation. Since the vast majority of CCW permit holders carry a handgun when they are out in public, the question of home defense becomes more pertinent to the 5.56 vs. 7.62 debate.

One of the most important factors to discuss in home defense is overpenetration. The absolute last thing any shooter wants is for their bullet to tunnel through the bad guy and into an innocent bystander.

Don't get me wrong, the 5.56 can easily penetrate through drywall and siding like the 7.62, however, the lighter weight bullets fired by the 5.56 are easier to deflect and should over-penetrate less than the 7.62x39.

Ammo and Rifle Price and Availability

Although ammo prices have trended upward ever since the coronavirus pandemic, 5.56 and 7.62x39 are still very affordable centerfire rifle rounds compared to larger ones like the 308 Winchester.

When it comes to 5.56 ammo, you can purchase brass cased or steel cased. Steel-cased ammo is cheaper because its cases cost significantly less to manufacture.

If you're looking for reliable brass-cased 5.56 training ammunition, look for Winchester USA (commonly known as "white box"). It has earned a strong reputation among AR-15 owners for delivering consistent performance at a reasonable price point. This makes it an excellent choice for high-volume range sessions where both reliability and affordability matter. Check out our Winchester 5.56 white box review for detailed testing results and unbeatable prices on Winchester 5.56 ammo!

As far as firearms are concerned, you have a plethora of options for both when it comes to semi-automatic rifles.

Firearm prices, sadly, are trending up just like ammunition. AK-47s used to be extremely inexpensive and easy to come by, but now they command a ~$700 price tag from most manufacturers.

Buying ammo in bulk is always smart. Make sure to check out our stock of .223 bulk ammo, 5.56 bulk ammo, and bulk 7.62x39 ammo.

The same could be said for AR-15s, as now they typically start around $700 and only go up from there depending on the manufacturer and add-ons you want. For bolt action rifles, the sky is the limit when it comes to 223 Remington/5.56 NATO. Multiple manufacturers offer bolt action rifles in 223 Rem as it is extremely popular with target shooters and varmint hunters. This is not the case with 7.62x39 and the round is only recently gaining popularity in the bolt action crowd. The Ruger American Hunter and CZ 527 are your only options for a bolt action 7.62x39 rifle currently.

7.62x39 vs 5.56 Ballistics Tables

Our team here at Ammo.com has spent countless hours scouring manufacturers' websites to compile the most extensive ballistics data for multiple loadings of 7.62x39 vs 5.56.

7.62x39 Ballistics Tables

Our comprehensive 7.62x39 ballistics resource provides extensive testing results that complement this direct comparison.

Note: This information comes from the manufacturer and is for informational purposes only. The actual ballistics obtained with your firearm can vary considerably from the advertised ballistics. Also, ballistics can vary from lot to lot with the same brand and type load.

5.56x45mm Ballistics: Chart of Average 5.56x45mm Ballistics

For shooters wanting detailed performance data across different barrel lengths and shooting conditions, our comprehensive 5.56 ballistics resource provides additional trajectory and energy information.

Note: This information comes from the manufacturer and is for informational purposes only. The actual ballistics obtained with your firearm can vary considerably from the advertised ballistics. Also, ballistics can vary from lot to lot with the same brand and type load.

Final Shots: 5.56 vs. 7.62

When it comes to the debate between 5.56 NATO and 7.62x39mm, it is unlikely that either rifle round will ever be crowned the victor.

The 7.62x39 is a hard-hitting cartridge designed to put a whole lot of lead into a target in a short time. Its punishing kinetic energy and terminal ballistics make short work of any bad guy it encounters, and its barrier-penetration capabilities are excellent for an intermediate rifle cartridge. However, the 7.62 suffers from a poor trajectory, as its less aerodynamic bullets hemorrhage velocity beyond 150 yards, limiting its effective range.

The 5.56x45mm NATO cartridge is a very flat-shooting, low-recoiling cartridge that is effective at both short and long range. Its lightweight bullets demonstrate the concept that "speed kills," and cause massive amounts of internal damage via hydrostatic shock. However, 5.56 is somewhat prone to deflection when it encounters a barrier en route to its target. It lacks extensive barrier-penetrating capability (although the M855A1 has somewhat mitigated this shortcoming).

Which round you choose is entirely up to you, your style of shooting, and which weapon system you prefer. If you like the rugged durability of an AK-47 or the WWII feel of an SKS, go with the 7.62x39. However, if you prefer long-range accuracy and the modularity of the AR-15, then the 5.56 has your name on it.

No matter which cartridge you choose, make sure you are proficient with your rifle. Stand ready to fight against tyranny should it ever pass over these hallowed lands again.

Written by

Wes Littlefield