Is M193 safe to shoot in .223 chambers?

[danez71]

There is no warning against the use of 5.56 ammunition anywhere on the website, or in the PDF manual.

That's simply not true.

AMMUNITION
The RUGER AMERICAN RIFLE® is chambered for many of the most popular factory-loaded cartridges manufactured in accordance with U.S. industry practice. The particular caliber for each rifle is rollmarked on the barrel. Use cartridges only of the designated caliber that is marked on the barrel. Please see “Warning - Ammunition” and “Warning - Loading” on page 14.

Then on page 14.

WARNING–AMMUNITION
Death, serious injury, and damage can result from the wrong ammunition, bore obstructions, powder overloads or incorrect cartridge components. Even the strongest gun can be blown up by excess pressure. Only use correct ammunition loaded to U.S. Industry Standards. Always wear shooting glasses and hearing protection.
IMPROPER AMMUNITION DESTROYS GUNS

Very confusing. Very disturbing. Very unnecessary.

You want to do something outside of what the manufacturer, on at least 2 pages, explicitly warn against and further states can cause serious injury or death.


..... very concerning that you repeatedly refuse to read.

...... very disturbing that you falsely claim that they don't warn you.

 

[Nuclear]

Also, the military infamously changed the type of powder used in the M193 ammo vs the original 223 loading. So to say they were/are the same is just not so.

Handloaders can, and do, produce the same velocities of the same projectiles using wildly different powders.

But if the OP refuses to take the advice of the members here, the referenced links, and the manufacturer of the firearm, then there truly is nothing further we can do, except hope he doesn’t kill or injure himself or others with his stubbornness.

 

[UrbanHermit]

That's simply not true.




Then on page 14.








You want to do something outside of what the manufacturer, on at least 2 pages, explicitly warn against and further states can cause serious injury or death.


..... very concerning that you repeatedly refuse to read.

...... very disturbing that you falsely claim that they don't warn you.

That is a general warning found in every manual that doesn't address the specific issue with 5.56/.223. By your reasoning, it is unsafe to shoot .38 Special in weapons chambered for .357 Magnum.

It says to only use correct ammunition loaded to industry standards. That would mean that you can use M193 ammunition in a rifle chambered for .223 Remington, because M193 is another name for .223 Remington and is loaded to the specifications of .223 Remington according to every source that I have seen. The issue is like using ammunition labelled "9mm Parabellum" in a pistol stamped "9mm Luger". They are the exact same cartridge. I'm still waiting for someone to show me actual evidence of any kind that this is incorrect.

 

[UrbanHermit]

Also, the military infamously changed the type of powder used in the M193 ammo vs the original 223 loading. So to say they were/are the same is just not so.

Handloaders can, and do, produce the same velocities of the same projectiles using wildly different powders.

But if the OP refuses to take the advice of the members here, the referenced links, and the manufacturer of the firearm, then there truly is nothing further we can do, except hope he doesn’t kill or injure himself or others with his stubbornness.

Quote the line from any of the links that states authoritatively that M193 ammunition SPECIFICALLY is unsafe in .223 firearms or is in any way distinct from .223. No evidence has been presented thus far to support this, unless it is buried in a wall of text in one of the links. I skimmed some of them and saw nothing that addresses this specific issue. The only answer that I have received is that it is unsafe because you shouldn't shoot 5.56 NATO ammunition, but this is false because M193 is not 5.56 NATO ammunition, it predates 5.56 NATO by 17 years, it is a military designation for .223 Remington, and and the boxes of ammunition I have that say "M193" do not have "NATO" printed anywhere on them. They just say "5.56", which is also a military designation for .223 Remington. The issue is not whether 5.56 NATO ammunition can be used in .223 Remington weapons, it is whether M193 can be used, and nobody has shown me a single piece of evidence that it cannot except for an anecdotal report about an action sticking.

 

[danez71]

That is a general warning found in every manual that doesn't address the specific issue with 5.56/.223. By your reasoning, it is unsafe to shoot .38 Special in weapons chambered for .357 Magnum.

That's absolutely FALSE.

Again, you're not reading. Instead, just trying to argue.

The Ruger 357 revovlers (LCR, SP01, etc) have similar statements in the Ruger manuals.

RUGER® GP100® revolvers will chamber the 357 Magnum, 38 Special +P, and the 38 Special cartridge.

 

[12Bravo20]

The US Military has been loading 5.56 to a higher chamber pressure from the start. They found that they had to bump up the power charger and chamber pressure to get the long range ballistic they wanted. In the development of the cartridge they found that they had to load it to 62,000 PSI. This all happened prior to the adoption of the M16 in 1963. The NATO designation started in 1977 when NATO standardized the 5,56 for use by all member countries. There was no change to how the cartridge was loaded at this time.

The civilian version which was released to the public in 1964 as the .223 was loaded to a maximum chamber pressure of 55,00 PSI per SAAMI specifications.

Now to discuss the actual chamber differences.

The military 5.56 chamber has a longer lead for several reasons. The first reason is so that the rifles can handle the higher 62,000 PIS chamber pressure and the second reason is so that the rifles will still extract fired cases with a dirty chamber during combat situations. The 223 SAAMI spec chamber is tighter for better accuracy and has a shorter lead so there is less bullet jump when fired. This leave less room for gas expansion at the chamber. The 5.56 M193 at 62K PSI will create unsafe chamber pressures when fired in the smaller 223 SAAMI chamber.

Here is the information you seek since you fail to read the articles for yourself and comprehend them.

5.56 mm NATO versus .223 Remington

The 5.56 mm NATO and .223 Remington cartridges and chamberings are similar but not identical.[43] While the cartridges are identical other than powder load, the chamber leade, i.e. the area where the rifling begins, is cut to a sharper angle on some .223 commercial chambers. Because of this, a cartridge loaded to generate 5.56mm pressures in a 5.56mm chamber may develop pressures that exceed SAAMI limits when fired from a short-leade .223 Remington chamber.

Pressure

C.I.P. defines the maximum service and proof test pressures of the .223 Remington cartridge equal to the 5.56 mm NATO, at 430 MPa (62,366 psi). This differs from the SAAMI maximum pressure specification for .223 Remington of 380 MPa (55,114 psi), due to CIP test protocols measuring pressure using a drilled case, rather than an intact case with a conformal piston, along with other differences.[47] NATO uses CIP pressure test protocols for their small arms ammunition specifications.

Because of these differences in methodology, the CIP pressure of 430 MPa (62,366 psi) is the same as a SAAMI pressure of 380 MPa (55,114 psi), which is reflected in US Military specifications for 5.56 mm NATO, which call for a mean maximum pressure of 55,000 PSI (when measured using a protocol similar to SAAMI).[48]

These pressures are generated and measured using a chamber cut to 5.56 NATO specifications, including the longer leade. Firing 5.56mm NATO from a chamber with a shorter .223 Remington leade can generate pressures in excess of SAAMI maximums.

Chamber

The 5.56 mm NATO chambering, known as a NATO or mil-spec chamber, has a longer leade, which is the distance between the mouth of the cartridge and the point at which the rifling engages the bullet. The .223 Remington chambering, known as SAAMI chamber, is allowed to have a shorter leade, and is only required to be proof tested to the lower SAAMI chamber pressure. To address these issues, various proprietary chambers exist, such as the Wylde chamber (Rock River Arms)[49] or the ArmaLite chamber, which are designed to handle both 5.56×45mm NATO and .223 Remington equally well. The dimensions and leade of the .223 Remington minimum C.I.P. chamber also differ from the 5.56 mm NATO chamber specification.

Using commercial .223 Remington cartridges in a 5.56 mm NATO chambered rifle should work reliably, but until recently, it was believed this was less accurate than when fired from a .223 Remington chambered gun due to the longer leade.[50] Although that may have been true in the early 1960s when the two rounds were developed, recent testing has shown that with today's ammunition, rifles chambered in 5.56mm can also fire .223 ammunition every bit as accurately as rifles chambered in .223 Remington, and the 5.56mm chamber has the additional advantage of being able to safely fire both calibers.[51] Using 5.56 mm NATO mil-spec cartridges (such as the M855) in a .223 Remington chambered rifle can lead to excessive wear and stress on the rifle and even be unsafe, and SAAMI recommends against the practice.[52][53] Some commercial rifles marked as ".223 Remington" are in fact suited for 5.56 mm NATO, such as many commercial AR-15 variants and the Ruger Mini-14 (marked ".223 cal"), but the manufacturer should always be consulted to verify that this is acceptable before attempting it, and signs of excessive pressure (such as flattening or gas staining of the primers) should be looked for in the initial testing with 5.56 mm NATO ammunition.[54]

This information is from: https://military.wikia.org/wiki/5.56×45mm_NATO#5.56_mm_NATO_versus_.223_Remington. And this also matches all of the other links we have provided for you. So as you can see the original military 5.56 that was adopted in 1963, and designated 5.56 NATO, is loaded hotter than civilian 223 (released in 1964). Since 1963 the only change to the military 5.56 ammunition was that it gained the "NATO" designation in 1977 when fully adopted by all NATO countries. It has always been loaded to a higher chamber pressure and a longer chamber to handle the extra pressure since it's adoption in 1963.

And here is another good article to read concerning the differences between true M193 mil spec ammo and civilian XM193 ammo. https://www.firearmreview.com/m-vs-xm-variants-of-5-56/. And YES there is a difference between the two. While XM193 is externally the same as M193, the XM193 is loaded to the lower pressure SAAMI 223 specifications. Some companies do not put the X on their packages but the ammo is still loaded to 223 specs.

 

[UrbanHermit]

Also, the military infamously changed the type of powder used in the M193 ammo vs the original 223 loading. So to say they were/are the same is just not so.

Handloaders can, and do, produce the same velocities of the same projectiles using wildly different powders.

But if the OP refuses to take the advice of the members here, the referenced links, and the manufacturer of the firearm, then there truly is nothing further we can do, except hope he doesn’t kill or injure himself or others with his stubbornness.

That's absolutely FALSE.

Again, you're not reading. Instead, just trying to argue.

The Ruger 357 revovlers (LCR, SP01, etc) have similar statements in the Ruger manuals.

Yes, the Ruger manual for the revolver addresses this compatibility issue. The other warning does not. We don't know if it's referring to M193, 5.56 NATO, or some idiot trying to shoot .22 Hornet in his .223. It's a vague, lawyerish sounding warning that one is likely to see in any firearm manual.

I just reread the first link that was posted by 12Bravo20 earlier, since everyone keeps telling me to read all this stuff and can't just quote the answer, and it says that .223 Remington and 5.56 NATO are loaded to the same specifications, and the confusion is because their pressures are tested differently. The article does not support what anyone is saying here, it contradicts everyone and supports what I am saying and what everything else I've read says.

 

[Blackbeard 44]

This is not advice, but it is what I would do, I would load a few rounds into the magazine and give it a try while carefully examining the shells after each shot looking for flattened primers, and extractor dents, make sure the action cycles smoothly, I myself regulary interchange .223 and 5.56 in all my riflles that shoot them.

 

[UrbanHermit]

The US Military has been loading 5.56 to a higher chamber pressure from the start. They found that they had to bump up the power charger and chamber pressure to get the long range ballistic they wanted. In the development of the cartridge they found that they had to load it to 62,000 PSI. This all happened prior to the adoption of the M16 in 1963. The NATO designation started in 1977 when NATO standardized the 5,56 for use by all member countries. There was no change to how the cartridge was loaded at this time.

The civilian version which was released to the public in 1964 as the .223 was loaded to a maximum chamber pressure of 55,00 PSI per SAAMI specifications.

Now to discuss the actual chamber differences.

The military 5.56 chamber has a longer lead for several reasons. The first reason is so that the rifles can handle the higher 62,000 PIS chamber pressure and the second reason is so that the rifles will still extract fired cases with a dirty chamber during combat situations. The 223 SAAMI spec chamber is tighter for better accuracy and has a shorter lead so there is less bullet jump when fired. This leave less room for gas expansion at the chamber. The 5.56 M193 at 62K PSI will create unsafe chamber pressures when fired in the smaller 223 SAAMI chamber.

Here is the information you seek since you fail to read the articles for yourself and comprehend them.







This information is from: https://military.wikia.org/wiki/5.56×45mm_NATO#5.56_mm_NATO_versus_.223_Remington. And this also matches all of the other links we have provided for you. So as you can see the original military 5.56 that was adopted in 1963, and designated 5.56 NATO, is loaded hotter than civilian 223 (released in 1964). Since 1963 the only change to the military 5.56 ammunition was that it gained the "NATO" designation in 1977 when fully adopted by all NATO countries. It has always been loaded to a higher chamber pressure and a longer chamber to handle the extra pressure since it's adoption in 1963.

And here is another good article to read concerning the differences between true M193 mil spec ammo and civilian XM193 ammo. https://www.firearmreview.com/m-vs-xm-variants-of-5-56/. And YES there is a difference between the two. While XM193 is externally the same as M193, the XM193 is loaded to the lower pressure SAAMI 223 specifications. Some companies do not put the X on their packages but the ammo is still loaded to 223 specs.

62K PSI by the military testing method is the same as 55K PSI by the SAAMI method according to the links posted.

None of these figures could be from a 5.56 NATO chamber in regards to the M193 round, because there was no such thing as 5.56 NATO. It it unsurprising that M193 ammunition is hotter than commercial .223 ammunition, but I have seen nothing showing that it exceeds .223 pressure limits, even in a .223 chamber.

When the NATO designation came to be, the round was changed to use a 62 grain steel core bullet. What I've read is that this bullet caused higher pressure and necessitated the infamous change in chamber dimensions. This is not relevant to shooting M193 in .223 chambered guns. M193 does not appear to be 5.56 NATO ammunition, in the same sense that .38 Special is not .357 Magnum ammunition. It appears to be hot .223 Remington ammunition according to everything I've read, including the sources posted here.

 

[UrbanHermit]

This is not advice, but it is what I would do, I would load a few rounds into the magazine and give it a try while carefully examining the shells after each shot looking for flattened primers, and extractor dents, make sure the action cycles smoothly, I myself regulary interchange .223 and 5.56 in all my riflles that shoot them.

I'm probably just going to put the 5.56 stuff away as backup/emergency ammo. I don't really want hot stuff anyway.

 

[UrbanHermit]

The US Military has been loading 5.56 to a higher chamber pressure from the start. They found that they had to bump up the power charger and chamber pressure to get the long range ballistic they wanted. In the development of the cartridge they found that they had to load it to 62,000 PSI. This all happened prior to the adoption of the M16 in 1963. The NATO designation started in 1977 when NATO standardized the 5,56 for use by all member countries. There was no change to how the cartridge was loaded at this time.

The civilian version which was released to the public in 1964 as the .223 was loaded to a maximum chamber pressure of 55,00 PSI per SAAMI specifications.

Now to discuss the actual chamber differences.

The military 5.56 chamber has a longer lead for several reasons. The first reason is so that the rifles can handle the higher 62,000 PIS chamber pressure and the second reason is so that the rifles will still extract fired cases with a dirty chamber during combat situations. The 223 SAAMI spec chamber is tighter for better accuracy and has a shorter lead so there is less bullet jump when fired. This leave less room for gas expansion at the chamber. The 5.56 M193 at 62K PSI will create unsafe chamber pressures when fired in the smaller 223 SAAMI chamber.

Here is the information you seek since you fail to read the articles for yourself and comprehend them.







This information is from: https://military.wikia.org/wiki/5.56×45mm_NATO#5.56_mm_NATO_versus_.223_Remington. And this also matches all of the other links we have provided for you. So as you can see the original military 5.56 that was adopted in 1963, and designated 5.56 NATO, is loaded hotter than civilian 223 (released in 1964). Since 1963 the only change to the military 5.56 ammunition was that it gained the "NATO" designation in 1977 when fully adopted by all NATO countries. It has always been loaded to a higher chamber pressure and a longer chamber to handle the extra pressure since it's adoption in 1963.

And here is another good article to read concerning the differences between true M193 mil spec ammo and civilian XM193 ammo. https://www.firearmreview.com/m-vs-xm-variants-of-5-56/. And YES there is a difference between the two. While XM193 is externally the same as M193, the XM193 is loaded to the lower pressure SAAMI 223 specifications. Some companies do not put the X on their packages but the ammo is still loaded to 223 specs.

I didn't see anything in your link that states that XM193 is loaded to .223 pressures. It says it doesn't meet military standards, which could mean anything. It could just mean that the primers aren't sealed right.

 

[danez71]

I just reread the first link that was posted by 12Bravo20 earlier, since everyone keeps telling me to read all this stuff and can't just quote the answer, and it says that .223 Remington and 5.56 NATO are loaded to the same specifications, and the confusion is because their pressures are tested differently. The article does not support what anyone is saying here, it contradicts everyone and supports what I am saying and what everything else I've read says.

No it doesnt.

Did you not read, or maybe just ignored, the bold part?

These pressures are generated and measured using a chamber cut to 5.56 NATO specifications, including the longer leade. Firing 5.56mm NATO from a chamber with a shorter .223 Remington leade can generate pressures in excess of SAAMI maximums.

Over simplifying, the 5.56 used in a 5.56 chamber is the same pressure as a .223 in a .223 chamber.

5.56 used in the smaller .223 chamber can generate pressure greater than SAMMI .223.


The answer was quoted and handed to you.

I'm probably just going to put the 5.56 stuff away as backup/emergency ammo. I don't really want hot stuff anyway.

You're either not comprehending it or refusing to accept it because it doesn't follow the conclusion you want.

These pressures are generated and measured using a chamber cut to 5.56 NATO specifications, including the longer leade. Firing 5.56mm NATO from a chamber with a shorter .223 Remington leade can generate pressures in excess of SAAMI maximums.

I'm probably just going to put the 5.56 stuff away as backup/emergency ammo. I don't really want hot stuff anyway.

So you acknowledge it's hotter but wanted to argue otherwise.

Got it. Intentionally argumentative.

 

[UrbanHermit]

These are the claims that I need to see evidence for:


- M193 ammunition is 5.56 NATO ammunition.

- M193 ammunition is loaded to pressures that exceed the limits for .223 Remington.

- M193 pressure data comes from chambers that are different from .223 Remington chambers, in the same way that later 5.56 NATO does.

I'm ctrl-Fing all the links that have been posted and have seen nothing supporting any of the above.

 

[UrbanHermit]

No it doesnt.

Did you not read, or maybe just ignored, the bold part?



Over simplifying, the 5.56 used in a 5.56 chamber is the same pressure as a .223 in a .223 chamber.

5.56 used in the smaller .223 chamber can generate pressure greater than SAMMI .223.


The answer was quoted and handed to you.



You're either not comprehending it or refusing to accept it because it doesn't follow the conclusion you want.








So you acknowledge it's hotter but wanted to argue otherwise.

Got it. Intentionally argumentative.

So then you shouldn't shoot 5.56 NATO ammunition in M16s from before 1979, because they were designed for M193/.223 Remington.

 

[Blackbeard 44]

I'm probably just going to put the 5.56 stuff away as backup/emergency ammo. I don't really want hot stuff anyway.

I wouldn't put it away untested, if your unsure of it, maybe trade it for some .223

 

[UrbanHermit]

I wouldn't put it away untested, if your unsure of it, maybe trade it for some .223

I'll sell it for $5/round in a few months.

 

[Slamfire]

All of the literature I have read describes the M193 as being identical to .223 Remington, and predating the 5.56 NATO.

If the M193 ammunition is made by the US military, then it meets US military specs. If it is made by a commercial firm, it meets whatever specifications the commercial firm wants it to met, and it is not military ammunition. It is just another marketing gimmick so Mall Ninja's will buy the stuff.

What exactly does the word "Tactical" mean on a box? Usually the images on the boxes have these uber techno warriors bristling with armaments.

Tactical carry anyone?

 

[12Bravo20]

Again

Pressure

C.I.P. defines the maximum service and proof test pressures of the .223 Remington cartridge equal to the 5.56 mm NATO, at 430 MPa (62,366 psi). This differs from the SAAMI maximum pressure specification for .223 Remington of 380 MPa (55,114 psi), due to CIP test protocols measuring pressure using a drilled case, rather than an intact case with a conformal piston, along with other differences.[47] NATO uses CIP pressure test protocols for their small arms ammunition specifications.

Because of these differences in methodology, the CIP pressure of 430 MPa (62,366 psi) is the same as a SAAMI pressure of 380 MPa (55,114 psi), which is reflected in US Military specifications for 5.56 mm NATO, which call for a mean maximum pressure of 55,000 PSI (when measured using a protocol similar to SAAMI).[48]

These pressures are generated and measured using a chamber cut to 5.56 NATO specifications, including the longer leade. Firing 5.56mm NATO from a chamber with a shorter .223 Remington leade can generate pressures in excess of SAAMI maximums.

And yes it is a well known fact that the 223 chamber IS shorter than a 5.56 chamber. And the 5.56 spec chamber has been in use on all US M16 rifles since 1965. Using ammo loaded to 62K PSI designed for a 5.56 chamber is unsafe in the shorter 223 chamber.

But hey, it's your gun, your hands, and your overall safety. We have given you all the information to stay safe. It is up to you to use or ignore the information and safety warnings.

 

[UrbanHermit]

If the M193 ammunition is made by the US military, then it meets US military specs. If it is made by a commercial firm, it meets whatever specifications the commercial firm wants it to met, and it is not military ammunition. It is just another marketing gimmick so Mall Ninja's will buy the stuff.

What exactly does the word "Tactical" mean on a box? Usually the images on the boxes have these uber techno warriors bristling with armaments.

Tactical carry anyone?

View attachment 1023621

The military specs consisted of a .223 Remington cartridge with a 55 grain bullet loaded to 52K psi. This was later increased to 55K psi. These specifications are from before the development of the 62 grain steel core 5.56 NATO round which necessitated a lengthening of the chamber's leade, suggesting they are from chambers identical to .223 Remington. Max pressure for .223 Remington is 55K psi. The military uses a different pressure testing technique than SAAMI, but one that superficially shows higher pressures, meaning that if the military specs for M193 show pressures at 55K psi, the SAAMI method would show pressures lower than that, well below pressure limits for .223 Remington.

This is contradicted by chronohraph data I've seen showing velocities for M193 ammunition as being significantly higher than .223 Remington ammunition in the same gun with the same bullet weight.

 

[UrbanHermit]

Deleted

 

[243winxb]

Lets looks at pressure (PSI).
A SAAMI 223 proof load Maximum Average is 78,500 PSI. A 223 working pressure is 55,000 PSI. NATO is said to be 60,000 PSI ??
QuickLoad claims a bullet jammed into the rifling will raise pressure by 10,000 PSI.

So, putting a Nato 60,000 PSI round in a 223 chamber, jammed into the rifling comes to 70,000 PSI? Still under the pressure of a proof load. Proof load brass would be scrap after firing, because of the pressure.
Bolt may need to be beat open with a wood block. Not good. May break off bolt handle.(its been done)

OLIN- Cartridge Brass-
Material is 70 copper/30 zinc with trace amounts of lead & iron , called C26000. Material starts to yield at 15,000 PSI when soft (annealed), and 63,000 PSI when hard.
Material yields, but continues to get stronger up to 47,000 PSI when soft, and 76,000 PSI
when work hardened.

Be Safe. Do not fire 5.56 ammo in a 223 chamber, as per SAAMI Warning. Do so at your own risk.

 

[12Bravo20]

And one last link to share. The does a good job talking about the differences between the ammo and the chambers.

https://www.luckygunner.com/labs/5-56-vs-223/

Now I am done posting in this thread since we can lead a horse to water but can't make it drink. In this case we gave all the pertinent information along with articles to support our statements and the OP fails to comprehend or does not want to listen.

 

[UrbanHermit]

And the 5.56 spec chamber has been in use on all US M16 rifles since 1965.

This is exactly the piece of information that is relevant to this discussion and requires a source. So far, nobody has explained how M193 specs could be from a chamber that is different from a .223 Remington chamber given that it predates both the 5.56 NATO cartridge and the 62 grain steel core bullet which necessitated an alteration to chamber dimensions.

My understanding is this:

- The military adopted the .223 Remington as their new service cartridge in the early 60s. They called it the "Cartridge, 5.56 mm ball M193".

- At some point a few years down the line, they changed the powder and increased the pressure. This change is reflected in max pressure limits for .223 Remington.

- In the late 70s, they decided they wanted a round with better penetration at long range, so they loaded it with a 62 grain steel core bullet that was very long and touched the lands of the chamber, causing a pressure spike. They began using a longer leade to address this issue with the 62 grain steel core bullet of the brand new 5.56X45mm NATO cartridge. The new cartridge was consequently overpressure in older rifles chambered for M193/.223 Remington.

- M193 is not a different cartridge from .223 Remington ammunition. It is not 5.56X45mm NATO ammunition. It is not loaded to higher pressure than .223 Remington ammunition. It's specifications are not measured in chambers that are different from the chambers of rifles chambered in .223 Remington. There is a tendency for M193 ammunition to be loaded to the higher end of pressure limitations, just as one manufacturer's 9mm Luger ammunition may be loaded hotter than the next manufacturer's offering.

- Using M193 in a rifle that is stamped ".223 Remington" does not violate the instructions in the manual to use only ammunition that the rifle is chambered for and meets industry standards, because M193 ammunition literally is .223 Remington ammunition and meets industry standards for .223 Remington ammunition.

- Using 5.56X45mm NATO ammunition, such as M855 "green tip" ammunition, would violate the manufacturers instructions, because this is a different cartridge from .223 Remington. Extrapolating this to include M193 ammunition is wrong, because M193 is not 5.56X45mm NATO, the boxes do not have the word "NATO" anywhere on them, and neither do the headstamps.

Every single confirmable fact regarding the M193 round points to the conclusion that it IS .223 Remington ammunition.

If the pressure specifications for M193 come from chambers that are different from .223 Remington chambers, I need to see a source for that specific claim.

 

[UrbanHermit]

And one last link to share. The does a good job talking about the differences between the ammo and the chambers.

https://www.luckygunner.com/labs/5-56-vs-223/

Now I am done posting in this thread since we can lead a horse to water but can't make it drink. In this case we gave all the pertinent information along with articles to support our statements and the OP fails to comprehend or does not want to listen.

Ctrl+F "M193".

0 results.

 

[UrbanHermit]

Be Safe. Do not fire 5.56 ammo in a 223 chamber, as per SAAMI Warning. Do so at your own risk.

I agree. You should only shoot .223 Remington/M193 ammunition in a rifle chambered for .223 Remington.