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Old 01-23-2021, 11:45 AM   #1
buckerup
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Default Educate Me 223 or 556

Iím currently downsizing my gun/ammo inventory. I have a bolt action hunting rifle in each caliber and ammo for each. Isnít one of the 2 caliber rifles capable or shooting both of the ammos, but the other caliber rifle can only shoot the ammo itís labeled for. Also is there any advantage/ benefit to one caliber of ammo over the other? Thanks for any input.
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Old 01-23-2021, 11:48 AM   #2
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.556 will shoot either. .223 is not supposed to shoot .556 but I have will no issues. Wylde is just a compromise between the 2.
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Old 01-23-2021, 11:48 AM   #3
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The .223 can only shoot .223. The .556 can shoot both.
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Old 01-23-2021, 11:50 AM   #4
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5.56 is what you want if you want to safely shoot either round. Do a quick google search and you will find a wealth of info about it.
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Old 01-23-2021, 11:52 AM   #5
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5.56 is what you want if you want to safely shoot either round. Do a quick google search and you will find a wealth of info about it.
Short and easy to understand. Thanks much.
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Old 01-23-2021, 11:54 AM   #6
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.556 will shoot either. .223 is not supposed to shoot .556 but I have will no issues. Wylde is just a compromise between the 2.
Both Tikka and CZ appear to follow the CIP standard. CZ says go ahead and use 5.56, because under the CIP standard it is safe. Yet, Tikka says don't use 5.56. My understanding is that the CIP standard accounts for the increased potential pressure of 5.56. As such, I am trying to understand why. I believe Bergara is the same.
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Old 01-23-2021, 12:54 PM   #7
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Originally Posted by ORIONTHEHUNTER View Post
Both Tikka and CZ appear to follow the CIP standard. CZ says go ahead and use 5.56, because under the CIP standard it is safe. Yet, Tikka says don't use 5.56. My understanding is that the CIP standard accounts for the increased potential pressure of 5.56. As such, I am trying to understand why. I believe Bergara is the same.
From a textbook/legal/extreme safety standpoint it is correct that firing .223 in a 5.56 chamber is ok whereas firing 5.56 in a .223 chamber may not be.

However, the reality is that any quality modern bolt action is built to far exceed the pressures developed by 5.56 in a .223 chamber. A .22-250 generates up to 65,000 psi, while burning substantially more powder, generating more bolt thrust due to the increased case diameter, against a weaker bolt due to having more material removed to accept the larger case head.

If you have some off brand stamped sheet metal Brazilian made .223 it might be a problem, otherwise itís unlikely to be.
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Old 01-23-2021, 02:00 PM   #8
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Quote:
Originally Posted by ORIONTHEHUNTER View Post
Both Tikka and CZ appear to follow the CIP standard. CZ says go ahead and use 5.56, because under the CIP standard it is safe. Yet, Tikka says don't use 5.56. My understanding is that the CIP standard accounts for the increased potential pressure of 5.56. As such, I am trying to understand why. I believe Bergara is the same.
I shoot 5.56 in my Tikka 223. I took the advice of a few guys that have done it with 10's of thousands of rounds in lots of Tikkas so I'm comfortable doing it.
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Old 01-23-2021, 02:02 PM   #9
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I would keep whichever is more accurate...
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Old 01-23-2021, 02:59 PM   #10
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So, the consensus ( is that the right word/spelling ) is that I’d be ok to shoot either round in either rifle?
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Old 01-23-2021, 03:56 PM   #11
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what guns do you have and what is the primary application for the one you are going to keep??
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Old 01-23-2021, 04:34 PM   #12
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Quote:
Originally Posted by buckerup View Post
So, the consensus ( is that the right word/spelling ) is that Iíd be ok to shoot either round in either rifle?

Yes. Donít over think it.


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Old 01-23-2021, 05:04 PM   #13
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556 is almost .224, but not quite.

.223 is .223

556 is .001 larger than .223
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Old 01-23-2021, 05:06 PM   #14
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Originally Posted by Shinesintx View Post
556 is almost .224, but not quite.

.223 is .223

556 is .001 larger than .223
What?????
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Old 01-23-2021, 05:22 PM   #15
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99.9% of the time you'll be fine. If you have a minimum dimension 223 chamber a maximum dimension 5.56 round you could have pressure problems. The Wylde chamber is good for both. If you have both why take the chance ? If the 556 is an accurate good shooting gun, keep it.
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Old 01-23-2021, 05:57 PM   #16
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Quote:
Originally Posted by Shinesintx View Post
556 is almost .224, but not quite.

.223 is .223

556 is .001 larger than .223

What the what?

This is why the internet is dangerous


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Old 01-23-2021, 06:07 PM   #17
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A mini 14 is labeled 223. It will shoot 556.
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Old 01-23-2021, 06:17 PM   #18
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Quote:
Originally Posted by 175gr7.62 View Post
What the what?

This is why the internet is dangerous


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Dangerous because many internet readers are unable to comprehend what they are reading, ie lack of reading comprehension.

The 556 NATO round is actually 5.71mm, which is .224 inches. The .223 is .223 inches. The size difference is .001. How is that dangerous information?

Edit: 556 supposedly has higher pressure, to that, I do not absolutely know.

Last edited by Shinesintx; 01-23-2021 at 06:19 PM.
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Old 01-23-2021, 06:21 PM   #19
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Quote:
Originally Posted by Shinesintx View Post
Dangerous because many internet readers are unable to comprehend what they are reading, ie lack of reading comprehension.

The 556 NATO round is actually 5.71mm, which is .224 inches. The .223 is .223 inches. The size difference is .001. How is that dangerous information?

Edit: 556 supposedly has higher pressure, to that, I do not absolutely know.
Because the .223 Remington is actually a .224 caliber. And 5.56 is loaded to a higher NATO spec pressure.
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Old 01-23-2021, 06:25 PM   #20
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They are exactly the same except for pressures and a 556 rifle has a slightly longer throat.
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Old 01-23-2021, 06:32 PM   #21
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Quote:
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Because the .223 Remington is actually a .224 caliber. And 5.56 is loaded to a higher NATO spec pressure.
What does the pressure mean? More powder? I donít understand that part.
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Old 01-23-2021, 06:38 PM   #22
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All modern 22 centerfire pills mic at .224...219 zipper / 220 swift / 221 fireball / 222 rem / 223 rem / 224 valkyrie / 225 win


5.56 is basically just a hot 223...do they even offer hunting rounds??
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Old 01-23-2021, 07:15 PM   #23
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What does the pressure mean? More powder? I donít understand that part.
SAAMI spec for the .223 Remington is 55,000. Thereís a European spec for the 5.56 thatís 62,000 and change. NATO ammo thatís marked with the circle cross headstamp (think circle around a plus sign) may be hotter than that. A 5.56 chamber has some small differences that allow the higher pressure that would be over pressure in the .223. A .223 Wylde will handle both. The higher pressure will get you 100+ fps over the .223 depending on the bullet.
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Old 01-23-2021, 07:45 PM   #24
175gr7.62
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Quote:
Originally Posted by Shinesintx View Post
Dangerous because many internet readers are unable to comprehend what they are reading, ie lack of reading comprehension.

The 556 NATO round is actually 5.71mm, which is .224 inches. The .223 is .223 inches. The size difference is .001. How is that dangerous information?

Edit: 556 supposedly has higher pressure, to that, I do not absolutely know.

Iím not going to bust your balls but the bullets are exactly the same. There are no .223 bullets. They are all .224


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Old 01-23-2021, 07:54 PM   #25
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I’m not going to bust your balls but the bullets are exactly the same. There are no .223 bullets. They are all .224


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I now understand it. I was wrong...by about .001 of an inch....but wrong nonetheless
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Old 01-23-2021, 08:07 PM   #26
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I now understand it. I was wrong...by about .001 of an inch....but wrong nonetheless
Size matters...and this who time I thought you were a guy??
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Old 01-23-2021, 09:06 PM   #27
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Quote:
Originally Posted by Shinesintx View Post
Dangerous because many internet readers are unable to comprehend what they are reading, ie lack of reading comprehension.

The 556 NATO round is actually 5.71mm, which is .224 inches. The .223 is .223 inches. The size difference is .001. How is that dangerous information?

Edit: 556 supposedly has higher pressure, to that, I do not absolutely know.


They both fire .224 projectiles.


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Old 01-23-2021, 09:18 PM   #28
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I know that shooting generic 556 vs quality LEO issue 223 is quite different....the 223 has a a much greater report.
For what it's worth, IMHO.
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Old 01-23-2021, 09:25 PM   #29
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Again with complete respect to all, your original comment was that you are downsizing your gun/ammo inventory. If your are downsizing, and going to one rifle, then the 556 would be the way to go with zero argument as to what you can or cannot shoot out of it.

Last edited by Kgert; 01-23-2021 at 09:31 PM.
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Old 01-24-2021, 08:09 AM   #30
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Quote:
Originally Posted by Kgert View Post
Again with complete respect to all, your original comment was that you are downsizing your gun/ammo inventory. If your are downsizing, and going to one rifle, then the 556 would be the way to go with zero argument as to what you can or cannot shoot out of it.
Yep.... or sell both and buy a Wylde chambered rifle.
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Old 01-24-2021, 09:03 AM   #31
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I have never bought projectiles that were only .223 they have all shown to be .224
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Old 01-24-2021, 09:49 AM   #32
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I used to have a Sako Vixen in .223 and I shot both out of it for many years. My Saber Defence AR15 don't care which one I feed it either. All guns are not created equal however. I would say if the round chambers easily and there is no excess resistance closing the bolt and no sticky cases after firing then you will be OK.
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