A day or two past, a portion of the Military Police of the State of LosAngeles, who’s also the shooting instructor of the association, delivered a comment in one of their articles asking us to explain to him what exactly the gaps between your 5.56x45mm NATO and the. 223 Remington. But before we respond, I would like to congratulate this Sergeant for seeking extra information to utilize in his guidelines. Regrettably we don’t see so many professionals seeking a deeper comprehension of the apparatus they use daily, whether those professionals out of the Public Security drives or maybe not.

But to talk about the gaps of these two calibers we should really go back a little 1957 if the 5.56x45mm NATO quality appeared for use for examining on AR platform using stripped lower receiver rifles. The concept of this caliber was that a smaller, lighter military ammunition would be developed, and that at 467 meters (500 yards), it may still be at supersonic speed, and that’s what they did with a projectile boattail of 55gr.

Though Remington knew that this grade will ruin the .222 Remington and the .222 Remington Magnum, Remington immediately, following the military adopted the 5.56x45mm NATO, ‘’ released the civilian model of this caliber, it was predicted .223 Remington. And that’s when all of the confusion started.

It’s a misconception to say that the 5.56x45mm NATO and .223 Remington gauges are the very same. That said, it may result in some dangerous situations for operators of the weapons. Although they seem identical on the outside, you can find a few differences which produce these calibers not synonymous between these weapons.

One of the big differences between them is that the pressure and also the attachment used as ar15 lower receiver and the aero lower. It’s somewhat confusing to talk about it, as how to measure NATO’s 5.56x45mm pressure differs from that of Remington’s .223. The .223 Remington is measured in either Copper Units of Pressure (CUP ) or, more recently, PSI (pounds per square inch), with a piezoelectric transducer at the 1 / 2 of this capsule. The military version, the 5.56x45mm NATO, is also quantified in PSI, however the transducer is placed within the mouth of the capsule. The different types of dimension already avoid a direct contrast, because the amounts reported in the NATO 5.56x45mm dimension are somewhat smaller, so even if the same ammunition is used after measuring the .223 Remington PSI. That happens because the pressure is quantified after, after it has reached its highest summit.

According to Jeff Hoffman, owner of this Black Hills Ammunition, military ammunition and also aero precision lower expert can reach 60,000 PSI, as measured by SAAMI ( Sporting Arms and Ammunition Manufacturers’ Institute) in precisely the exact same manner since the .223 Remington is measured. As the .223 Remington can reach a max of 55,000 PSI, and if the 5.56x45mm is measured with the transducer at the mouth of this capsule, it reaches the most of 58,000 PSI.

Another significant difference is that normally the leade (distance between the start of the raid at the cone as well as the finish of the chamber) of armaments in 5.56x45mm NATO is of 0.162 “and the leade of weapons in .223 Remington is made of 0,085. That is, that the leade firearms in NATO 5,56x45mm is nearly twice that of the .223 Remington along with the angle which leade is also different between those weapons and all this generates an increase in either the general pressure in armament and pressure peaks.

Because the projectile makes almost entire contact with the barrel rationing in .223 Remington armaments, that possess short lea , a dangerous situation is created when shooting ammunition in 5.56x45mm NATO. Camera pressures can increase radically and catastrophic failures may occur.

The alternative, firing ammunition .223 Remington in a 5.56x45mm armament NATO, that has the very long leade , is not too dangerous, what may happen is losing of precision and speed in the shots, but serious failures due to of large increases in pressure, cannot happen.

NATO 5.56x45mm capsules have thicker walls, this was made to withstand the stress generated by the high pressures inside the chamber with its noveske kx5 attachment. This lessens the amount of propellant that may be put right into it. When your 5.56x45mm NATO capsule is utilised to be packed with the exact same amount of gunpowder that’s safe in an ammunition.222 Remington, because the walls are smaller and thicker, when firing this mulch, high pressures can also be generated.

However, several rationing steps are employed from the arms of those calibers, each for a particular sort of projectile. A 1:12 “tape toss (most are .223 Remington bolt action rifles) will better stabilize projectiles upto 65gr. Already a step of 1:14 “, will soon be better useful if you use ammunitions of around 55gr. Plumbing of just one: 8, tend to be better suitable for projectile munitions up to 80gr. And people who have 1: 9 pitch are made to own a improved performance compared to projectiles of up to 73gr are all used.

There is no certainty that the armaments made in NATO 5.56x45mm will do the job properly if terminated compost .223 Remington. All these armaments are manufactured to cycle safely when the chamber is under high pressures and thicker projectiles are used.

How dangerous and serious is it to shoot 5.56x45mm NATO ammunition at .223 Remington firearms? Dangerous enough for SAAMI, at the division “Combining Weapons and Unsafe Ammunition” from the book “ SAAMI Technical Correspondent’s Handbook “, to consider it unsafe, saying that “In firearms made from .223 Remington, don’t use military ammunition 5.56x45mm BORN.”

ATK, an ammunition manufacturer that is a portion of this Federal and also Speer collection, has recently issued a biography entitled “The gap between Remington’s .223 along with NATO Military 5.56x45mm,” and within this ATK attests that using 5.56x45mm NATO ammunition in armaments .223 Remington, could result in: “... gas leaks, exploded ammunition, exploded capsules and brittle weaponry.”

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ArmaLite will not believe it really is just as dangerous as SAAMI and ATK state. Back in ArmaLite’s technical note # 74, they say that “millions of 5.56x45mm NATO ammunition were dismissed safely in to Eagle Arms and ArmaLite armaments with cameras which have met SAAMI specifications for the last 22 years,” and hadn’t any catastrophic failure.

What exactly does all this mean? Should you operate a NATO 5.56x45mm rifle, then you can take it with both ammunition at 5.56x45mm NATO and ammunition at .223 Remington safely. In case the barrel pitch of one’s armament is just 1: 1 “you ought to use ammunition with projectiles upto 60gr or even thicker. If the pitch is 1:12 “you should use ammunition with projectiles milder than 60gr. And if you work with a weapon made for .223 Remington, you ought not use 5.56x45mm ammunition of any kind.

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5.56x45mm NATO weapons have a inch: 1 “or inch: 6" rationing step to stabilize heavy and long projectiles over long distances. Any weapon with a 1: 7 “raid step will work best with projectiles around 90gr.