I've heard that myth for ever that you can only fire a .223 out of a .556 but you cannot fire a .556 out of a .223 or such.
But this is bogus, they are the exact same round.
So people say that well it's the pressure, the pressure is higher in the .556 round than the .223 because of the smaller interior space, but this won't matter at all when firing your .556 in a .223 chamber.
There is absolutely no difference in the dimensions of the brass so unless you load a .223 quantity in a .556 casing you'll have no problem and even then at most you'll just risk blowing the casing which isn't usually a significant problem, persay.
But what buffoon is going to load that much powder in the .556 round? Come on.
Thread: Shooting .223 and .556 rounds
12-05-2010, 07:00 PM #1
Shooting .223 and .556 rounds
12-05-2010, 07:04 PM #2
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12-05-2010, 07:06 PM #4
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12-05-2010, 07:10 PM #6
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5.56 is loaded hotter. That along with a .223 barrel having a shorter leade, leads to increase pressure. It isn't recommended to shoot 5.56 out a .223 barrel for safety precautions. When it comes to firearms, I always make sure to take all safety precautions available to me. Not something I want to take a chance with.
* Problems may occur when firing the higher-pressure 5.56mm cartridge in a .223 chamber with its much shorter leade. It is generally known that shortening the leade can dramatically increase chamber pressure. In some cases, this higher pressure could result in primer pocket gas leaks, blown cartridge case heads and gun functioning issues.
12-05-2010, 07:16 PM #7
No difference in cartridge case dimensions, they are identical. Rather it is the throat lead dimensions that are different in the chambering of the rifle, the 5.56 NATO is throated for military ammunition, the .223 Remington is throated for commercial ammo like you buy on the shelves (differences in bullet lengths/weights). The chambers are different , ones civilian and one is military, one throat is just more optimized for one specific type of ammo. The ammo is actually interchangeable.
12-05-2010, 07:16 PM #8
12-05-2010, 07:18 PM #9
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12-05-2010, 07:23 PM #10
12-05-2010, 07:24 PM #11
12-05-2010, 07:27 PM #12
And ALLUCANEATRIBS I'm sorry I was off by one angle of incidence by a fraction of a degree, a miniscule difference at best and in no way effects performance.
Accuracy errors come from overloading powder not from the round.
12-05-2010, 07:28 PM #13
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12-05-2010, 07:32 PM #15
12-05-2010, 07:34 PM #16
12-05-2010, 07:35 PM #17
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12-05-2010, 07:37 PM #18
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12-05-2010, 07:44 PM #20
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