5.56 in a .223 bolt gun

[Gunnerlove]

The reality is that you will likely have no issues except if you do. Watch out for pressure signs.

5.56mm NATO is not .223. OFTEN INTERCHANGEABLE but not the same.

 

[Gunnerlove]

A more recent hype is the .223 Wylde chamber which supposedly would be the remedy to all these 223/556 concerns. I've never looked into the details as I think it's more of a marketing gimmick.

You can't be bothered to look into why it exists?.....why it was created?.....when it was created? Yet you are giving advice it?

You are the internet.

 

[Winterkrieg]

"Commercial vs. Military Standards

Ammunition manufactured to military standards can, depending on the cartridge, have identical or near-identical dimensions to a SAAMI commercial cartridge, like 223 Remington/5.56 x 45 mm NATO.

However, ammunition made to military standards can have higher pressure levels than their commercial counterparts, and the firearms designed to fire these military cartridges may have different construction and barrel geometry to handle these higher pressures. Similarly, surplus military firearms may have headspace dimensions that are within acceptable limits to a military standard but would be excessive for a SAAMI commercial cartridge (7.62 x 51 mm NATO/308 Winchester is one example).

Therefore, only use ammunition manufactured to military standards in firearms that are marked and chambered explicitly to accept that specific military cartridge. Failure to do so can result in serious injury or death to the user and/or bystanders, as well as damage to the firearm.

It is safe to shoot 223 Remington ammunition in a 5.56 military specification chamber. The firearm manufacturer can verify whether the chamber in your firearm meets that definition.

However, due to the sizeable number of "wildcat" or non-military specification 5.56 chamber geometries in existence, SAAMI recommends that you consult the firearm owner’s manual or contact the firearm manufacturer for further guidance as to whether your firearm can safely shoot 223 Remington ammunition.

However, it is not safe to shoot "5.56," "5.56 NATO," or "5.56 x 45 mm" ammunition in a barrel marked as being chambered in 223 Remington for a number of reasons. The main reason being that a barrel marked as chambered in 223 Remington will have a shorter throat into the rifling than a “5.56” barrel which may cause increased pressure if the "5.56" ammunition is fired in it. This can result in serious injury or death to the user and/or bystanders, as well as damage to the firearm." -SAAMI

https ://www.forsterproducts.com/pdf/brochures/nato1.pdf

 

[riversrest]

You can't be bothered to look into why it exists?.....why it was created?.....when it was created? Yet you are giving advice it?

You are the internet.

No, I cannot be bothered to look into it in detail because I don't need it. And no, I don't "giving advice it" !

 

[I Dont Care About You]

"Commercial vs. Military Standards

Ammunition manufactured to military standards can, depending on the cartridge, have identical or near-identical dimensions to a SAAMI commercial cartridge, like 223 Remington/5.56 x 45 mm NATO.

However, ammunition made to military standards can have higher pressure levels than their commercial counterparts, and the firearms designed to fire these military cartridges may have different construction and barrel geometry to handle these higher pressures. Similarly, surplus military firearms may have headspace dimensions that are within acceptable limits to a military standard but would be excessive for a SAAMI commercial cartridge (7.62 x 51 mm NATO/308 Winchester is one example).

Therefore, only use ammunition manufactured to military standards in firearms that are marked and chambered explicitly to accept that specific military cartridge. Failure to do so can result in serious injury or death to the user and/or bystanders, as well as damage to the firearm.

It is safe to shoot 223 Remington ammunition in a 5.56 military specification chamber. The firearm manufacturer can verify whether the chamber in your firearm meets that definition.

However, due to the sizeable number of "wildcat" or non-military specification 5.56 chamber geometries in existence, SAAMI recommends that you consult the firearm owner’s manual or contact the firearm manufacturer for further guidance as to whether your firearm can safely shoot 223 Remington ammunition.

However, it is not safe to shoot "5.56," "5.56 NATO," or "5.56 x 45 mm" ammunition in a barrel marked as being chambered in 223 Remington for a number of reasons. The main reason being that a barrel marked as chambered in 223 Remington will have a shorter throat into the rifling than a “5.56” barrel which may cause increased pressure if the "5.56" ammunition is fired in it. This can result in serious injury or death to the user and/or bystanders, as well as damage to the firearm." -SAAMI

https ://www.forsterproducts.com/pdf/brochures/nato1.pdf

Well, if a lawyer said its not safe then for sure its not safe.

"They also said there were WMD's in Iraq, artificial sweeteners were safe and Anna Nichole married for love......"

When was the last time you heard a lawyer say something outside the rules was safe?

 

[Blastattack]

"Commercial vs. Military Standards

Ammunition manufactured to military standards can, depending on the cartridge, have identical or near-identical dimensions to a SAAMI commercial cartridge, like 223 Remington/5.56 x 45 mm NATO.

However, ammunition made to military standards can have higher pressure levels than their commercial counterparts, and the firearms designed to fire these military cartridges may have different construction and barrel geometry to handle these higher pressures. Similarly, surplus military firearms may have headspace dimensions that are within acceptable limits to a military standard but would be excessive for a SAAMI commercial cartridge (7.62 x 51 mm NATO/308 Winchester is one example).

Therefore, only use ammunition manufactured to military standards in firearms that are marked and chambered explicitly to accept that specific military cartridge. Failure to do so can result in serious injury or death to the user and/or bystanders, as well as damage to the firearm.

It is safe to shoot 223 Remington ammunition in a 5.56 military specification chamber. The firearm manufacturer can verify whether the chamber in your firearm meets that definition.

However, due to the sizeable number of "wildcat" or non-military specification 5.56 chamber geometries in existence, SAAMI recommends that you consult the firearm owner’s manual or contact the firearm manufacturer for further guidance as to whether your firearm can safely shoot 223 Remington ammunition.

However, it is not safe to shoot "5.56," "5.56 NATO," or "5.56 x 45 mm" ammunition in a barrel marked as being chambered in 223 Remington for a number of reasons. The main reason being that a barrel marked as chambered in 223 Remington will have a shorter throat into the rifling than a “5.56” barrel which may cause increased pressure if the "5.56" ammunition is fired in it. This can result in serious injury or death to the user and/or bystanders, as well as damage to the firearm." -SAAMI

https ://www.forsterproducts.com/pdf/brochures/nato1.pdf

This has literally never happened, ever. Nor has there ever been any evidence to support this statement. Firing any firearm at any time under any random set of circumstances could "result in serious injury or death to the user and/or bystanders, as well as damage to the firearm.", but the likely hood is near zero, so near zero that it's not even measurable.

 

[beltfed]

The SAAMI spec is bang on - referencing rifles that are proofed in the US.
Blown primers absolutely do damage the firearm. It may seem minor, but firing 5.56 in a tight .223 chamber can and often do blow the primer out of the brass casings, or will pierce the primer at the firing pin detent, with possible damage to the firing pin and possibly bolt. This is so common in fact it is comical to think people in this thread are actually posting the opposite is true.

Back to the OP's question specifically about his CZ 600 Trail - it is proofed in Europe to CIP standards. CIP doesn't designate between the two as it is my understanding European manufacturers account for both in their chambering of their rifles.

 

[I Dont Care About You]

This has literally never happened, ever. Nor has there ever been any evidence to support this statement. Firing any firearm at any time under any random set of circumstances could "result in serious injury or death to the user and/or bystanders, as well as damage to the firearm.", but the likely hood is near zero, so near zero that it's not even measurable.

If one considers the issue on a per capita (per round) basis, the number of times it causes a problem divided by the number of rounds fired (billions, maybe tens of billions) the problem approaches zero.

 

[Ipscshooters]

 

[Winterkrieg]

...

 

[Petrock]

Check cz website, i can shoot 5.56 out of my 527 .223 rem. They make their actions to Sustain 5.56 but label them .223 supposedly. That’s their claim. I’ve shot 556 out of it no problems

This is done a lot to avoid litigation. They can't necessarily sell military calibers.... but they can sell civilian calibers lol

 

[jakester]

I am thinking of purchasing a CZ600 Trail, which is chambered in .223 Remington. The issue is that I have a large stockpile of 5.56 ammo. Now I have read about all the yes, no, maybe so opinions on shooting 5.56 in a .223, but am looking for any first hand experience/advice for doing such a thing in the CZ600 Trail. Thank you!

Yes. My friend owns one, all he runs in it is 5.56 55gr fmj rounds. If there were any issues, he'd have run across them by now. Can't speak toward anybody else's rifle though.

 

[RifleDude]

Anybody bothering to read the sticky in this forum on this subect? This has een hashed out probably every 2 or 3 months by now. Give it rest already.