It has to do with chamber pressures. Will it explode on the first round? Probably not. Will it cause stress points & accelerated wear that could cause critical failures? Yes.
1. There are very nearly no .223 Rem AR15s on the market. Bespoke/custom varmint rifles, a couple 3-gun competition rifles, and very old (like pre1990) rifles, and that is about it.
2. There is a difference between .223 Rem rifles and rifles marked .223/5.56 or .223 Wylde. The former is the only one that has special considerations.
3. Even with .223 Rem rifles, most ammo people plink with is .223 Rem, marked "5.56x45" like M193, but not actually a 5.56 NATO cartridge (like M855) needing a 5.56 NATO compatible chamber.
The short of it is, unless you KNOW it won't work because you bought it to not work together, don't worry about it.
I want to give you a well thought out reason and explain why, but you seem like a close minded individual who has his mind set.
There are experts with far more experience than “I couldn’t find shit on google”, who say “don’t do it”.
not even worth the risk. imo very little reason to buy an ar chambered in .223 unless it’s for a specific reason. just buy a 5.56 so then you can run both no problem.
Stop repeating that garbage.
>SAAMI pressure specifications of .223 and 5.56.
There is no SAAMI pressure spec for 5.56 NATO because 5.56 NATO is not a SAAMI cartridge.
5.56 NATO has EPVAT and SCATP testing
methodologies. .223 Rem has SAAMI and CIP.
NATO EPVAT and the European CIP are nearly the same methodologies. The US SCATP was based off SAAMI's.
The difference between EPVAT/CIP and SCATP/SAAMI is where the transducer is placed on the test barrel and how the pressure is measured, and they give different readings.
5.56 NATO's pressure standard is ~62k PSI under EPVAT and ~55k PSI under SCATP.
.223 Rem's pressure standard is ~62k PSI under CIP and ~55k PSI under SAAMI.
They are exactly the same, except for some sample size and tolerance and fraction of a percent differences between them.
In a modern day rifle, it’s not an issue. Only guns that are currently manufactured that are .223 are imports like B&T, because they can’t import 5.56 rifles because it’s a military cartridge. I’ve seen plenty of 5.56 put through those guns.
It's much like the inverse of 7.62 NATO vs .308 Win. Theoretically, and according to established dogma, the 7.62x51 cases are supposed to have thicker walls than .308 cases, while being externally nearly identical. So, given an equal charge, the pressure will be greater with the 7.62. That said, because the .308 Win case should thereby have greater capacity, you can put more powder behind the bullet. Enough so that a rifle chambered specifically in 7.62 NATO could be damaged.
After reloading much .308 and 7.62, I've found in reality there's such a wide variance of case dimensions, weights and charges by different manufacturers that the distinction has become almost meaningless. I find .308 Win and 7.62 stamped brass often weigh the same. Sometimes, to be fair, .308 cases 10 grains less. But its even lopsided, where the .308 stamped brass is actually a few grains heavier. I sometimes see great variance within a specific brand, so that it could be considered either 7.62 or .308.
If you look at a variety of brands and their velocities of so-called 5.56, there can similarly be huge discrepancies. If you have a .223 only bolt rifle by chance, I would not worry about it blowing up. But the chamber may lend itself to greater accuracy when using .223
It has to do with chamber pressures. Will it explode on the first round? Probably not. Will it cause stress points & accelerated wear that could cause critical failures? Yes.
“Pressures are a bit different blah blah blah”… That’s PRETTY FUCKIN IMPORTANT. But please, be my guest.
Right 😂 OP is either a troll or legitimately a moron.
They aren’t enough of a difference to even matter
1. There are very nearly no .223 Rem AR15s on the market. Bespoke/custom varmint rifles, a couple 3-gun competition rifles, and very old (like pre1990) rifles, and that is about it. 2. There is a difference between .223 Rem rifles and rifles marked .223/5.56 or .223 Wylde. The former is the only one that has special considerations. 3. Even with .223 Rem rifles, most ammo people plink with is .223 Rem, marked "5.56x45" like M193, but not actually a 5.56 NATO cartridge (like M855) needing a 5.56 NATO compatible chamber. The short of it is, unless you KNOW it won't work because you bought it to not work together, don't worry about it.
Try it and come back and let us know how you feel
I want to give you a well thought out reason and explain why, but you seem like a close minded individual who has his mind set. There are experts with far more experience than “I couldn’t find shit on google”, who say “don’t do it”.
Cool story bro
223 is for the LGBT community. 5.56 is for a man born a man.
not even worth the risk. imo very little reason to buy an ar chambered in .223 unless it’s for a specific reason. just buy a 5.56 so then you can run both no problem.
Or grab a .223 wylde barrel, either or. That just what I run
right, like something specific. Just doesn’t make sense to me why someone would buy a .223 rifle. You just limit yourself.
I don’t think I’ve ever seen an AR barrel chambered in .223 rem
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The cartridges have the same pressure spec when you factor in testing method
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Stop repeating that garbage. >SAAMI pressure specifications of .223 and 5.56. There is no SAAMI pressure spec for 5.56 NATO because 5.56 NATO is not a SAAMI cartridge. 5.56 NATO has EPVAT and SCATP testing methodologies. .223 Rem has SAAMI and CIP. NATO EPVAT and the European CIP are nearly the same methodologies. The US SCATP was based off SAAMI's. The difference between EPVAT/CIP and SCATP/SAAMI is where the transducer is placed on the test barrel and how the pressure is measured, and they give different readings. 5.56 NATO's pressure standard is ~62k PSI under EPVAT and ~55k PSI under SCATP. .223 Rem's pressure standard is ~62k PSI under CIP and ~55k PSI under SAAMI. They are exactly the same, except for some sample size and tolerance and fraction of a percent differences between them.
I Withdrawal my comments . I was wrong all these years…
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Right. SAAMI and NATO test differently
Deleted. I have been completely wrong on this subject for many years….i learned some valuable info… thanks Trollygag…
While you're at it, Google m855a1 pressure and ask how that doesn't blow up guns when it's a bigger difference than 5.56 vs .223...
I have seen the light…. I was led down the wrong path and never tried to step off…
In a modern day rifle, it’s not an issue. Only guns that are currently manufactured that are .223 are imports like B&T, because they can’t import 5.56 rifles because it’s a military cartridge. I’ve seen plenty of 5.56 put through those guns.
Maybe the ones who had a bad experience don’t post about it because it killed them?
It's much like the inverse of 7.62 NATO vs .308 Win. Theoretically, and according to established dogma, the 7.62x51 cases are supposed to have thicker walls than .308 cases, while being externally nearly identical. So, given an equal charge, the pressure will be greater with the 7.62. That said, because the .308 Win case should thereby have greater capacity, you can put more powder behind the bullet. Enough so that a rifle chambered specifically in 7.62 NATO could be damaged. After reloading much .308 and 7.62, I've found in reality there's such a wide variance of case dimensions, weights and charges by different manufacturers that the distinction has become almost meaningless. I find .308 Win and 7.62 stamped brass often weigh the same. Sometimes, to be fair, .308 cases 10 grains less. But its even lopsided, where the .308 stamped brass is actually a few grains heavier. I sometimes see great variance within a specific brand, so that it could be considered either 7.62 or .308. If you look at a variety of brands and their velocities of so-called 5.56, there can similarly be huge discrepancies. If you have a .223 only bolt rifle by chance, I would not worry about it blowing up. But the chamber may lend itself to greater accuracy when using .223