Half way through, work meeting now and will read rest once I get home.
Thanks for the link/info
Half way through, work meeting now and will read rest once I get home.
Thanks for the link/info
Nope. It's the charge, not the case.
Check your chamber differences!
chambers are cut different but you can have a tight 5.56 that is tighter than a loose .223.
In my load work ups in many different guns i find some barrels are faster than others ..You guys I am sure have seen that also.
Tighter bore vs a looser one should increase pressures.
I can pull a bore snake through my .308 savage with minimal pull strength.
Take the same Bore snake and I must wrap the string around my hand to pull it through my Mossberg 30-06 ATR.
One 18" barrel .308 savage I have shoots the same velocity as a Ruger 22" .308 I have.
I have heard one guy tell about 3 different 30-06 ATR rifles.. 2 had mild recoils and one was a shoulder punisher.
Mine is a shoulder punisher.
It is also a very fast rifle.
I think there is much more to the pressure situation than just the chamber cut..You must look at other aspects.
In my load work ups in many different guns i find some barrels are faster than others ..You guys I am sure have seen that also.
Tighter bore vs a looser one should increase pressures.
I can pull a bore snake through my .308 savage with minimal pull strength.
Take the same Bore snake and I must wrap the string around my hand to pull it through my Mossberg 30-06 ATR.
One 18" barrel .308 savage I have shoots the same velocity as a Ruger 22" .308 I have.
I have heard one guy tell about 3 different 30-06 ATR rifles.. 2 had mild recoils and one was a shoulder punisher.
Mine is a shoulder punisher.
It is also a very fast rifle.
I think there is much more to the pressure situation than just the chamber cut..You must look at other aspects.
The Chambers
The significant difference between the .223 Rem and 5.56 NATO lies in the rifles, rather than the cartridges themselves. Both the .223 and 5.56 rounds will chamber in rifles designed for either cartridge, but the critical component, leade, will be different in each rifle.
The leade is the area of the barrel in front of the chamber prior to where the rifling begins. This is where the loaded bullet is located when a cartridge is chambered. The leade is frequently called the “throat.”
On a .223 Remington spec rifle, the leade will be 0.085”. This is the standard described by the Sporting Arms and Ammunition Manufacturers’ Institute, Inc. (SAAMI). The leade in a 5.56 NATO spec rifle is 0.162”, or almost double the leade of the .223 rifle.
A shorter leade in a SAAMI spec rifle creates a situation where the bullet in a 5.56 NATO round, when chambered, can contact the rifling prior to being fired. By having contact with the rifling prematurely (at the moment of firing), chamber pressure can be dramatically increased, creating the danger of a ruptured case or other cartridge/gun failure.
The reverse situation, a .223 Rem round in a 5.56 NATO gun, isn’t dangerous. The leade is longer, so a slight loss in velocity and accuracy may be experienced, but there is not a danger of increased pressures and subsequent catastrophic failure.
How serious is the danger of firing 5.56 ammo in .223 guns? Dangerous enough that the SAAMI lists 5.56 military ammo as being not for use in .223 firearms in the technical data sheet titled “Unsafe Firearm-Ammunition Combinations.”
ATK, the parent company of ammunition manufacturers Federal Cartridge Company and Speer, published a bulletin entitled “The Difference Between 223 Rem and 5.56 Military Cartridges.” In this bulletin, ATK stated using 5.56 ammo in a .223 rifle could result in “…primer pocket gas leaks, blown cartridge case heads, and gun functioning issues.”
However, the danger may be lower than SAAMI or ATK suggest. In Technical Note #74 from ArmaLite, the company states “millions of rounds of NATO ammunition have been fired safely in Eagle Arms and ArmaLite’s® SAAMI chambers over the past 22 years,” and they have not had any catastrophic failures.
According to ArmaLite:
“Occasionally a non-standard round (of generally imported) ammunition will fit too tightly in the leade, and resistance to early bullet movement can cause elevated chamber pressures. These pressures are revealed by overly flattened primers or by powder stains around the primer that reveal leaking gasses.”
http://humanevents.com/2011/02/15/223-remington-vs-556-nato-what-you-dont-know-could-hurt-you/
The significant difference between the .223 Rem and 5.56 NATO lies in the rifles, rather than the cartridges themselves. Both the .223 and 5.56 rounds will chamber in rifles designed for either cartridge, but the critical component, leade, will be different in each rifle.
The leade is the area of the barrel in front of the chamber prior to where the rifling begins. This is where the loaded bullet is located when a cartridge is chambered. The leade is frequently called the “throat.”
On a .223 Remington spec rifle, the leade will be 0.085”. This is the standard described by the Sporting Arms and Ammunition Manufacturers’ Institute, Inc. (SAAMI). The leade in a 5.56 NATO spec rifle is 0.162”, or almost double the leade of the .223 rifle.
A shorter leade in a SAAMI spec rifle creates a situation where the bullet in a 5.56 NATO round, when chambered, can contact the rifling prior to being fired. By having contact with the rifling prematurely (at the moment of firing), chamber pressure can be dramatically increased, creating the danger of a ruptured case or other cartridge/gun failure.
The reverse situation, a .223 Rem round in a 5.56 NATO gun, isn’t dangerous. The leade is longer, so a slight loss in velocity and accuracy may be experienced, but there is not a danger of increased pressures and subsequent catastrophic failure.
How serious is the danger of firing 5.56 ammo in .223 guns? Dangerous enough that the SAAMI lists 5.56 military ammo as being not for use in .223 firearms in the technical data sheet titled “Unsafe Firearm-Ammunition Combinations.”
ATK, the parent company of ammunition manufacturers Federal Cartridge Company and Speer, published a bulletin entitled “The Difference Between 223 Rem and 5.56 Military Cartridges.” In this bulletin, ATK stated using 5.56 ammo in a .223 rifle could result in “…primer pocket gas leaks, blown cartridge case heads, and gun functioning issues.”
However, the danger may be lower than SAAMI or ATK suggest. In Technical Note #74 from ArmaLite, the company states “millions of rounds of NATO ammunition have been fired safely in Eagle Arms and ArmaLite’s® SAAMI chambers over the past 22 years,” and they have not had any catastrophic failures.
According to ArmaLite:
“Occasionally a non-standard round (of generally imported) ammunition will fit too tightly in the leade, and resistance to early bullet movement can cause elevated chamber pressures. These pressures are revealed by overly flattened primers or by powder stains around the primer that reveal leaking gasses.”
http://humanevents.com/2011/02/15/223-remington-vs-556-nato-what-you-dont-know-could-hurt-you/
Thank you Dennis.
youre welcome Brent. You dumbass
I have always understood the issue to be a minimal chance of occurrence; BUT who wants to be that one guy that it happens to
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