If1HitU
Member
Very nice,beautiful looking rifle.Same rifle same accuracy. My 40-X Remington can't tell the difference and doesn't care.View attachment 776707
Very nice,beautiful looking rifle.Same rifle same accuracy. My 40-X Remington can't tell the difference and doesn't care.View attachment 776707
NATO is same pressure as 223REM.
The only difference is throat leade angle in the chamber to accomodate military bullet shape/seating.
I have a Mossberg MVP .556 It's a bolt action with a 24" barrel 1:9 twist. Someone told me that .223 is manufactured to tighter specifactions than .556 Is that hog wash ? I will be shooting at 100 to 300 yards max targets only. Also, what weight bullets do you recommend?
Thanks, Jim
My once fired 5.56 cases measure between 1.757" and 1.760". My Sierra loading manual lists case length for the 223 as 1.760".If you buy a bag of once-fired 5.56 brass and measure their lengths...you'll find all of them WAY longer than .223 max specs.
This is assuming the 223 chamber is cut to SAAMI minimum dimensions. I suspect makers are cutting their 223 barrels with more generous throats and gentler leade angles.This statement is only true with proper context.
The chamber is different for .223 and 5.56 NATO.
If you shoot 5.56 NATO ammo in a 5.56 NATO chamber the recommended maximum pressure is the 55,000 PSI (approximately).
If you shoot .223 REM in a .223 REM chamber the recommended maximum pressure is 55,000 PSI.
If you shoot .223 REM ammo that produces 55,000 PSI in a .223 REM chamber and you shoot it in a 5.56 chamber it will produce less pressure.
If you shoot 5.56 NATO ammo that produces 55,000 PSI in a 5.56 NATO chamber and you shoot it in a .223 REM chamber it will produce more pressure.
When this discussion arises remember that it is the chambers that are different.
This is assuming the 223 chamber is cut to SAAMI minimum dimensions. I suspect makers are cutting their 223 barrels with more generous throats and gentler leade angles.
It has nothing to do with the proof round. It has to do with the freebore. If a barrel is marked "223 Remington" but the makers consider it safe for 5.56, it means makers are likely using a longer freebore. If so, the barrel does NOT conform to SAAMI specifications.
Ah, now I understand.I am saying that the proof round for .223 REM is probably hotter than a standard 5.56 round shot in a .223, and therefore a 5.56 round should not blow up in your face when shot from a .223. That is my conjecture.
Not to mention that stinkin primer crimpThat is why I prefer to buy .223 used brass rather than used LC brass if I am going to buy it. The brass fired in a SAW can be a pain to bring back to loadable condition.
My once fired 5.56 cases measure between 1.757" and 1.760". My Sierra loading manual lists case length for the 223 as 1.760".
I like this part. The internet sure has changed things up. Lol.Before the internet they were the same thing and people have been shooting them interchangeably for years..
The measurement was taken after being fired, not resized. Lake City cases, crimped primers, roll crimp at the mouth, manufactured by Federal, fired in my AR.
Your post made it sound like the cases were overly long before they were fired and just after being fired.
A lot of cases are overly long after being resized.
Yep. But, I can't imagine firing a SAW without that primer crimp given what I know about them. The primer crimp removal for 5.56 is simply one more reason why I prefer .223 pre-fired brass to 5.56. I don't load to max where thicker brass might be useful. Compared with used 5.56 brass, I rarely see much problem in used .223 brass.Not to mention that stinkin primer crimp