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02-04-2013, 01:23 PM #2627
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02-04-2013, 02:01 PM #2628
correct, The primary difference between .223 Remington and 5.56 x 45 mm is that .223 is loaded to lower pressures and velocities compared to 5.56 mm. .223 Remington ammunition can be safely fired in a 5.56 mm chambered gun, but the reverse can be an unsafe combination. The additional pressure created by 5.56 mm ammo will frequently cause over-pressure problems such as difficult extraction, flowing brass, or popped primers, but in extreme cases, could damage or destroy the rifle. Chambers cut to .223 Remington specifications have a shorter leade (throat) area as well as slightly shorter headspace dimensions compared to 5.56 mm "military" chamber specs, which contributes to the pressure issues.
While the 5.56 mm and .223 cartridges are very similar, they are not identical. Military cases are made from thicker brass than commercial cases, which reduces the powder capacity (an important consideration for handloaders), and the NATO specification allows a higher chamber pressure. Test barrels made for 5.56mm NATO measure chamber pressure at the case mouth, as opposed to the SAAMI location. This difference accounts for upwards of 20,000+ psi difference in pressure measurements. That means that advertised pressure of 58,000 psi for 5.56mm NATO, is around 78,000 psi tested in .223 Rem test barrels (SAAMI .223 Rem Proof MAP is 78,500 psi so every 5.56mm round fired is a proof load, very dangerous). The 5.56 mm chambering, known as a NATO or mil-spec chambers, have 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 chambering, known as the "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[2] or the Armalite chamber, which are designed to handle both 5.56 mm and .223 equally well.
Using commercial .223 cartridges in a 5.56-chambered rifle should work reliably, but generally will not be as accurate as when fired from a .223-chambered gun due to the excessive leade. Using 5.56 mil-spec cartridges (such as the M855) in a .223-chambered rifle can lead to excessive wear and stress on the rifle and even be unsafe, and the SAAMI recommends against the practice. Some commercial rifles marked as ".223 Remington" are in fact suited for 5.56 mm, such as many commercial AR-15 variants and the Ruger Mini-14, 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 ammunition.GOVERNMENT
The only parasite dumb enough to kill it's host
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02-04-2013, 04:25 PM #2629
this is why I have an Modern sporting rifle
http://www.youtube.com/watch?feature...&v=qKTutSMZ4FUGOVERNMENT
The only parasite dumb enough to kill it's host
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02-04-2013, 04:37 PM #2630
Damn, she is very skilled at cleaning the buffer spring! How come this video link doesn't come with all AR-15's? I really paid attention to that one!
They that can give up essential liberty to obtain a little temporary safety deserve neither safety nor liberty.
Benjamin Franklin
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02-04-2013, 05:09 PM #2631
ya Kinda liked the way she can clean a gun.
GOVERNMENT
The only parasite dumb enough to kill it's host
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02-04-2013, 07:08 PM #2632
What gun?
Keep the fire inside the fireplace.
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02-04-2013, 07:28 PM #2633
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02-04-2013, 09:34 PM #2634
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02-04-2013, 09:40 PM #2635
Brian,
You don't know half of what you think that you know, yet you're quite willing to run off at the mouth about it.
I've pointed out so many factual errors in your arguments throughout this discussion that the only reason that I keep coming back is to see what foolishness you're going to spout, next.
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02-04-2013, 10:15 PM #2636
Let's see.
You THINK that it is illegal to carry a concealed weapon in California. You were wrong.
You THINK that the proposed AWB is about magazine size alone. You were wrong again.
You THINK that machine guns are illegal. You were wrong.
You THINK that Federally licensed dealers can sell guns at a gun show without performing a background check. You were wrong.
I'm sure there are others, but those are the four that I remember right off the top of my head.
So, what makes you THINK that any of your other half-informed opinions would be accurate?
I THINK that you need to spend a little more time learning the laws of this nation regarding firearms and maybe learn the laws of your OWN STATE before you run your mouth any more.
Sure, an assault weapon ban will work. It will work as well as the ban on alcohol worked in the 20s and 30s. It will work as well as the prohibition on drugs has worked.
Of course, you're so invested now in your argument that you cannot back down now without losing face, but seriously, educate yourself.
You don't know half of what you think you do.
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02-04-2013, 10:17 PM #2637
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02-04-2013, 10:27 PM #2638
Brian is a shill for leftist political agendas. You have failed to prove him wrong. You may prove him wrong on dozens of points of fact, but the leftist agenda remains. Brian is the steadfast winner of any argument here, he is militant leftist and no amount of logic or reasoning will defeat his leftist purpose. Nothing.
Not much point in discussion, just need to stamp them down politically. Tiring to argue with them.I draw all my schematics in crayon now. If they cannot always be correct, they can at least be colorful.
Service calls submitted after 3PM will be posted the next business day.
I give free estimates [Wild Ass Guesses] over the phone.
I am not in business to make money from other people so that I can afford to work for you for free.
If the fall is over, mmmm let's say, 6 feet or so,.. I do not 'bounce' very well.
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02-04-2013, 10:31 PM #2639
I have guns for self defense, to protect my family, by any means necessary- God forbid.
Sic Semper Tyrannis.



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