What is the difference between 5.56 NATO and 223 Rem ammunition? - Hornady Law Enforcement (2024)

Differences between the two are small but can have a large impact on performance, safety and weapon function.

The first difference is the higher pressure level of the 5.56 NATO cartridge which runs at approximately 58,000 psi. A 223 Remington is loaded to approximately 55,000 psi.

The second and most important difference between the two is the fact that a 5.56 NATO chamber has a .125” longer throat. This allows approximately one more grain of powder to be loaded into a 5.56 NATO cartridge; this is what gives it higher performance than its 223 Remington cousin.

The biggest problem with these differences is when firing a 5.56 NATO cartridge in a rifle chambered for 223 Rem. Due to the longer throat that the NATO chamber employs this combination will cause a 223 chambered weapon to run at approximately 65,000 psi or more. This is 10,000 psi higher than the 223’s normal functioning pressure of 55,000 psi. This is NOT safe and will cause primers to back out, or worse, cause harm to the operator, the rifle, or both.

The reverse of this is firing a 223 Rem cartridge in a 5.56 NATO chambered rifle. Due to the throat difference between the two chambers a 223 Rem cartridge may not work optimally in a 5.56 NATO chambered weapon. The cause of this is the lack of pressure built by a 223 Rem cartridge fired from a 5.56 NATO chamber. The 223’s 55,000 psi will not be attained and therefore velocity and performance are hurt. Problems start occurring when this combination is fired out of a 5.56 NATO chambered rifle with a 14.5” (or shorter) barrel. The lower powder charge of the 223 round coupled with the pressure drop that occurs when it is fired in a the 5.56 NATO chamber will cause the rifle to cycle improperly. NATO chambered rifles with barrels longer than 14.5” should function properly when firing 223 Rem ammunition.

What is the difference between 5.56 NATO and 223 Rem ammunition? - Hornady Law Enforcement (2024)

FAQs

What is the difference between 5.56 NATO and 223 Rem ammunition? - Hornady Law Enforcement? ›

The first difference is the higher pressure level of the 5.56 NATO cartridge which runs at approximately 58,000 psi. A 223 Remington is loaded to approximately 55,000 psi. The second and most important difference between the two is the fact that a 5.56 NATO chamber has a . 125” longer throat.

What 223 is best for law enforcement? ›

The Hornady® 223 Rem 55 gr. TAP Urban® is the preferred choice for use in SBRs, carbines, and rifles when the probability for barrier penetration is low. Rapid expansion provides dramatic wound cavities, massive fragmentation, and prevents over penetration on non-barrier engagements.

Which is more powerful .223 or 5.56 NATO? ›

5.56 vs 223 Pressure Difference

The 5.56 NATO has a higher pressure than the 223 round and is one of the two major differences. The 5.56 NATO pressure is about 58,000 psi and the 223 round is approximately 55,000 psi.

Can you shoot 223 Rem in a 5.56 NATO? ›

223 in a 556? You can safely shoot 223 Remington ammunition in a rifle chambered for 556. Due to the increased pressure of the 556 round, NEVER shoot 556 ammunition in a rifle intended for 223.

Is 223 and 5.56 NATO the same round? ›

223 rounds are virtually identical in size to 5.56mm rounds. This means that the majority of the time, . 223 ammunition will chamber and fire in a 5.56mm chamber and vice versa. However, the biggest difference between the two is that 5.56x45mm ammunition is loaded to a significantly higher pressure than .

Do police use 223 or 556? ›

Widely used law enforcement rifle calibers are . 223 Remington, 5.56x45mm NATO, . 308 Winchester, and 7.62x51mm NATO.

What is the most popular ammo used by law enforcement? ›

The ammunition of choice for the department is Federal Premium . 40-caliber, 165-grain EFMJ. For a non-hollow point round, it offers a larger and heavier round with a controlled expansion and penetration.

Why does the military use 556 and not 223? ›

Hornady Law Enforcement and Military

Differences between the two are small but can have a large impact on performance, safety and weapon function. The first difference is the higher pressure level of the 5.56 NATO cartridge which runs at approximately 58,000 psi. A 223 Remington is loaded to approximately 55,000 psi.

Why choose .223 over 556? ›

The 223 bullet has dimensions that seal the contents tighter as compared to the 5.56 bullet. This compensates for the pressure difference in the two when fired from the same case. The smaller gun powder capacity on the 223 bullet, however, means that the 223 have lower power as compared to the 5.56.

What is 5.56 NATO equivalent to? ›

Published January 28, 2018. The two primary calibers for small arms that are NATO standards are the 5.56 x 45mm and the 7.62 x 51mm and they have their civilian equivalents. The 5.56 x 45mm is the . 223 Remington while the civilian form of the 7.62 x 51mm is the .

What is green tip ammo? ›

Green-tip ammunition is most common in 5.56/. 223 Rem caliber and is mainly designed for use with the AR platform. These rounds were originally considered controversial, as they meet one of the criteria of the federal definition of armor-piercing ammunition.

What size is 5.56 compared to 223? ›

Case cartridges for the 5.56 NATO (5.56 x 45 mm) and the . 223 Remington are very similar. For all practical purposes, the external dimensions are identical, and one can effectively say that there exists no difference between the two.

What is the range of a 223 rifle? ›

223 Rem. can maintain enough velocity to take varmint and medium-sized game out to 250 yards, or the distance at which the bullet is still travelling about 2,300 fps, according to Frank C. Barnes' “Cartridges of the World.” But that range doesn't apply to every bullet.

Is 5.56 more powerful than 9mm? ›

The 5.56 rifle cartridge is inherently more powerful than the 9mm pistol cartridge, so you might expect the 5.56 to be a lot louder than the 9mm, but that's not the case. They're actually pretty close to one another. The 9mm cartridge averages about 166 decibels while the 5.56 cartridge averages about 169 decibels.

Can you load 223 brass to 5.56 specs? ›

223 brass is safe to use in any firearm chambered for . 223 or 5.56x45mm. If loaded to 5.56 pressures, you need to use firearms labeled for use with 5.56mm.

What does NATO mean in ammo? ›

NATO ammunition refers to the small arms cartridges used by the member-states of the North Atlantic Treaty Organization. Read on to understand the differences between a given cartridge's civilian and NATO variants and determine if it's safe to shoot NATO ammo in your guns. Josh Montgomery.

What type of 5.56 do police use? ›

Based on this research, I would recommend that the best 5.56X45mm/. 223 cal bullet for law enforcement use in patrol carbines is the 55 grain FMJ bullet.

What type of 556 do police use? ›

223 caliber (5.56mm NATO) offers Tactical Officers the ability to penetrate body armor (which is becoming.

What brand of AR-15 do law enforcement use? ›

Patrol Rifle - AR-15 Colt or Bushmaster – the AR15 is the most commonly observed rifle in police patrol. The weapon system is safe, accurate, reliable, effective, and easily deployed by officers of all stature due to its lightweight, low recoil, and general ease of operation.

Which is the best ammunition for law enforcers why? ›

The . 40 S&W caliber is the overwhelming top choice of police departments today, followed by the . 357 SIG and the . 45.

What ammo do police snipers use? ›

At the present time, in both the Western world and within NATO, the 7.62×51mm is currently the primary cartridge of choice for military and police sniper rifles.

What is the best caliber for law enforcement? ›

As 9mm becomes the caliber of choice for law enforcement agencies and individual officers, other once popular calibers are falling by the wayside.

What is replacing the 5.56 in the military? ›

The new weapon system will use the 6.8 mm family of ammunition instead of the 5.56 mm ammunition the M4/M16 utilized. The 6.8 mm has proven to outperform most modern 5.56mm and 7.62mm ammunition against a full array of targets.

What is 5.56 NATO good for? ›

The 5.56 NATO round is excellent for target shooting and 3-gun competitions. Generally, the longer the barrel, the more accurate the rifle will be. That's why AR-15s with 20-inch stainless steel barrels rule here. 5.56 bolt-action rifles are incredibly accurate too.

Are all AR-15s 223 and 556? ›

There are three types of chambers in the M16/M4/AR-15/MSR family of rifles, but most people think there are only two. The first is the Mil-Spec 5.56mm chamber, which is used in the M16 and M4. The second is the . 223 chamber, the most common chamber in AR-15 rifles, although you can get AR-15s with a 5.56mm chamber.

Why 223 is the best? ›

The . 223, especially in an AR rifle, has very little recoil and allows a new shooter to fire a full-power rifle with little discomfort or fear. Low ammunition weight means that a shooter can carry more of it and sweat less on long match days and hunting trips.

What grain is best for 5.56 NATO? ›

Winchester 5.56 NATO M855 62gr FMJ LC 20-round box

Winchester's 62-grain rounds are the best 5.56 rounds for the 5.56 1×9 barrel since a faster twist rate does a better job at stabilizing heavier bullets. These bullets generate 3060 fps of muzzle velocity and 1289 ft/lb of muzzle energy.

What is the NATO equivalent of .223 ammo? ›

The .223 Rem. and the 5.56 NATO are nearly identical, but not identical enough to disregard their slight differences. Those differences are unlikely to impact performance, but they can impact safety, which is why you should never fire a 5.56 NATO cartridge in a gun chambered for .223 Rem.

Why can't you shoot green tip ammo? ›

You can't shoot green tip ammo at most shooting ranges because it's made to penetrate steel, and most indoor shooting ranges use steel to catch bullets. While the steel backdrop would likely still stop a green tip bullet, it would incur a lot of damage, costing the range a lot of money.

What bullets are illegal in the US? ›

Possession of "handgun ammunition" designed primarily to penetrate metal or armor is a felony; manufacturing, importing, selling, offering for sale, or transporting armor-piercing handgun ammunition is a felony; police officers who believe they have found some armor-piercing ammunition should take samples for testing ...

What does a red tip ammo mean? ›

Red Tip Ammo Meaning

Military ammo with a red tip indicates tracer ammunition. Tracer bullets have a hollow base that is filled with magnesium. The flash from the propellant ignites this flammable metal which burns and becomes brightly visible in flight.

What is the most popular AR-15 ammo? ›

Of course, the most popular by far will always be the 5.56x45mm NATO round. Developed in conjunction with the AR15 by Eugene Stoner, the cartridge was designed for a change in fighting doctrine from previous wars.

What is the most accurate barrel length for 223? ›

223 Rem do best with a 16" barrel and 1:8 twist rate. For . 308 and 7.62 NATO, a 20" barrel and 1:12 twist rate works best for all loads. For all 300 BLK loads, a barrel measuring 9" to 11.5" provides optimal velocity.

Why is 223 banned from hunting? ›

223 bullets are manufactured with full metal jackets, which would be unlawful to use.

How far does a 223 drop at 300 yards? ›

223 Remington ~ 55 Grain ~ Trajectory Chart
Range (Yards)Velocity (Ft/Sec)Bullet Path (inches)
1002846.81.41
2002502.40
3002168.2-7.01
4001850.2-21.48
2 more rows

How far does a 223 drop at 500 yards? ›

223 FMJ bullet since the higher weight also reduces muzzle velocity to around 2,700 FPS. If you zero that in at 50 yards, it will hit 4.2 inches low at 200 yards. At 500 yards you hit 72.2 inches (6 feet) low and at 1,000 yards it is 549.3 inches low or more than 45 feet.

Does 5.56 penetrate walls? ›

Though the 5.56 bullets showed the most deformation, they were also terribly penetrative (19 panels, or nine walls) and, beyond the first two or three panels, created relatively large holes as they tumbled along their paths.

How far can a 5.56 round penetrate? ›

The 5.56×45mm NATO SS109/M855 cartridge (NATO: SS109; U.S.: M855) with standard 62 gr. lead core bullets with steel penetrator will penetrate about 38 to 51 cm (15 to 20 in) into soft tissue in ideal circ*mstances.

Can you shoot 223 and 556 interchangeable? ›

While the two cartridges are modifications of the same platform, they aren't always interchangeable. A . 223 round is compatible with a 5.56 rifle in most cases. On the other hand, a 5.56 can significantly damage a barrel and chamber when fired from a rifle only designed to shoot .

What is the difference between steel and brass .223 ammo? ›

Brass ammo is generally considered to be better than steel-cased ammo because it creates a better chamber seal than steel. Thus you have less blowback into the chamber and the receiver. Brass is better at this sealing action because it is more malleable than steel. So, it expands to snugly fit the walls of the chamber.

What is the difference between 5.56 NATO and 5.56 223? ›

5.56 vs 223 Case Difference

223 cartridge is the longer throat on the casing. The 5.56 NATO has a . 125″ longer throat. This allows for an additional grain of powder to be loaded in the cartridge and gives the 5.56 NATO the performance it's known for.

What's the difference between Luger and NATO? ›

9mm NATO rounds have higher pressures than standard 9mm Luger rounds. To make a comparison, a 9mm NATO round would be like a 9mm +P round in terms of pressure. That's the biggest difference. 9mm NATO is a bit spicier than 9mm Luger.

What is the most common NATO round? ›

The 7.62×51mm NATO (official NATO nomenclature 7.62 NATO) is a rimless, bottlenecked rifle cartridge. It is a standard for small arms among NATO countries.

What 223 ammo does the FBI use? ›

Federal LE ammo is designed for law enforcement, and its Tactical non Toxic allows for better accuracy and lethal performance unlike any other 223 ammo on the market today. It is a great choice for target practice at the range for Law Enforcement agencies, this is the same ammunition as the FBI contract.

What AR-15 does police use? ›

Patrol Rifle - AR-15 Colt or Bushmaster – the AR15 is the most commonly observed rifle in police patrol. The weapon system is safe, accurate, reliable, effective, and easily deployed by officers of all stature due to its lightweight, low recoil, and general ease of operation. IV.

Why do police use 223? ›

They also offer better wound ballistics at longer ranges than lighter weight bullets. At close and intermediate ranges (under 100 yards), when no intermediate barriers are present and headshots can be made, the . 223 with heavier weight bullets may provide acceptable accuracy and wounding effectiveness.

What ammo does US Marshals use? ›

The primary handgun for marshals are Staccato Model P 2011 pistols in 9mm Parabellum. Deputy Marshals may also carry a backup gun, but it must meet certain requirements.

What is the military version of the 223? ›

The official name for .223 Remington in the US Army is cartridge 5.56 x 45mm ball, M193. If a 5.56×45mm NATO cartridge is loaded into a chamber intended to use .223 Remington, the bullet will be in contact with the rifling and the forcing cone is very tight.

What ammo does the US Border Patrol use? ›

9mm Duty Ammunition (147 Grain)

What gun do most police officers carry? ›

By far the most popular police service pistol in the United States, the GLOCK 22 fires the potent 40 S&W cartridge and holds more rounds for its size and weight than most other full-sized handgun in its class.

What AR-15 does swat use? ›

One common artillery choice in this category includes AR15s such as M4a1, CQBR, and Colt Commando guns. Different models of Sig Sauers and HKs are also used by SWAT team members. Various models of Benelli (i.e. M1, M4, M1014), Remington (i.e. 870, 1100), and Mossberg (i.e. 500, 590) guns are used.

What gun does the FBI use? ›

FBI SWAT is known to use the M4 carbine, Heckler & Koch MP5/10, Remington 870, Remington 700, various Glock models (17 Gen4, 19M, 20), SIG Sauer P226, and Springfield Armory 1911 Professional Custom.

What is the killing range of a 223 rifle? ›

The 223 effective range is the distance at which a rifle can be accurately fired. The effective range for 223 is 400 to 600 yards . This means that if you are shooting at a target that is within this range, you should be able to hit it with little to no problem.

What 223 ammo is best for self defense? ›

223 Rem. Speer's Gold Dot is a familiar name in the defensive ammunition market, having a long-established track record of purpose-built defensive loads. In this category, Speer offers three bullet weights for the . 223 Rem., with 55-grain, 62-grain and 75-grain projectiles.

What is the best grain bullet for 556? ›

Winchester's 62-grain rounds are the best 5.56 rounds for the 5.56 1×9 barrel since a faster twist rate does a better job at stabilizing heavier bullets. These bullets generate 3060 fps of muzzle velocity and 1289 ft/lb of muzzle energy.

What .556 ammo do cops use? ›

A look at the primary entry weapons used by SWAT officers today reveals most are using two calibers; . 223 caliber (5.56 NATO) and 9mm. The primary bullet used in these calibers is either the soft point ammunition for the . 223 caliber (5.56 NATO) or the jacketed hollow point (JHP) in the 9mm.

Do cops use 556? ›

Hornady's TAP line of rifle ammunition has become an industry standard for high performance law enforcement ammunition. Their 75 gr. BTHP TAP (Tactical Action Police) round in 5.56mm (.

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