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Old 09-06-2012, 03:12 AM   #11
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Because the chamber specs are just SLIGHTLY different. Meaning, the 5.56 would fit better, lending to better accuracy, as that's what it's meant for.

That's the theory anyway. You just never can tell what any individual gun will do.

And, I'm talking about differences that COULD be as little as .2 MOA. They could be more though.
You are correct that he chamber specs are slightly different, but the external dimensions of the ammo are identical.


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Old 09-06-2012, 03:47 AM   #12
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Originally Posted by steve4102

You are correct that he chamber specs are slightly different, but the external dimensions of the ammo are identical.
And do you think that makes no impact?


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Old 09-06-2012, 04:44 AM   #13
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And do you think that makes no impact?
As the external dimensions of the 223 and 5.56 are identical, how can "that" have any impact?
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Old 09-06-2012, 06:02 AM   #14
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there is a "leade" difference between the two rounds........the 5.56 round "sits" in the throat of the barrel a lil more forward, thus seatin the actual bullet into the barrel, thus givin a more accurate "jump" out of the barrel due to more, initial metal on metal contact.

the shorter lead in the .223 round causes the actual bullet to have to close the distance between it's start position and the longer throat (because of the longer leade) of the .556 barrel. this "gap" between the two metals (still metal on metal contact, but not as much as 5.56) causes the bullet to have to "slam (if you will)" into the barrel, and thus lose a bit of accuracy.

or that's how i see and read it.

http://le.atk.com/pdf/223VS556.pdf

http://www.rifleshootermag.com/2012/02/02/5-56-and-223-are-they-different/

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Old 09-06-2012, 06:04 AM   #15
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NATO EPVAT and SAAMI test chamber pressures in different locations. The differences in testing standards account for upwards of 20,000 psi difference. That said, NATO EPVAT tests at the case mouth, SAAMI does not. CIP tested both at the same location and came up with the same pressures.

Question I have, does the leade difference account for the similar pressures, did CIP test both rounds in a rifle chambered for only one?

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Old 09-06-2012, 12:44 PM   #16
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From a purely anecdotal perspective, I get much better accuracy with factory .223 ammo (Hornady) out of my RRA Entry Tactical (5.56) AR-15 compared to the M-193 and M-855 rounds I've shot from American Eagle and Winchester.

Unscientific, I'll grant you, but it's a fact, Jack.

If I had to guess the reason, I'd say that "mil-spec" assures a minimum level of quality and consistency, whereas commercial ammunition often meets higher QC standards.

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Old 09-07-2012, 02:24 AM   #17
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Quote:
Originally Posted by treehugger49 View Post
From a purely anecdotal perspective, I get much better accuracy with factory .223 ammo (Hornady) out of my RRA Entry Tactical (5.56) AR-15 compared to the M-193 and M-855 rounds I've shot from American Eagle and Winchester.

Unscientific, I'll grant you, but it's a fact, Jack.

If I had to guess the reason, I'd say that "mil-spec" assures a minimum level of quality and consistency, whereas commercial ammunition often meets higher QC standards.

and that could very well be. every rifle has it's favorite ammo.


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