ammo questions
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Old 08-25-2011, 02:50 PM   #1
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Default ammo questions

I am confused on ammo.

What is the diff in .223 and 5.56? Guessing one is military round and cheaper to find surplus ammo?

Will the cheap steel case 223 hurt my AR15?

Which is better range/accurate ?

Thanks.

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Old 08-25-2011, 02:59 PM   #2
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Slight difference, 5.56 is loaded to different pressure levels than .223 some rifles like the Mini 14 are marked to shoot both interchangeably. Some are not.

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Old 08-25-2011, 03:23 PM   #3
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Generally, it is safe to fire .223 Remington in a 5.56 NATO chambered rifle, but it is not necessarily safe to fire 5.56 NATO ammunition in a .223

Remington rifle. This is because 5.56 NATO ammunition is rated for higher pressure than .223 Remington.

If you have a 5.56 NATO rifle, you can shoot both 5.56 NATO and .223 Remington ammunition safely. If you have a .223 Remington chambered rifle it’s best to stick with .223 Remington ammunition.

If you want accuracy the .223 Remington can in some cases be a better way to go using factory ammunition and shot in a .223 barreled rifle.

http://www.armalite.com/images/Tech%20Notes%5CTECH%20NOTE%2074%20%205.56%20vs%202 23%20vs%20Wylde%20090817%20Rev%200.pdf


http://ar15barrels.com/data/223vs556.pdf
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Old 08-25-2011, 03:29 PM   #4
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If your rifle is marked that is chambered for .223 it is not advisable to shoot 5.56 ammo in it. As already stated the 5.56 is loaded to produce higher pressures than .223. The chamber geometry of the .223 is different from that of the 556 chamber. This difference helps the .223 round perform better, but causes the 556 round to reach dangerously high chamber pressure levels. Which could cause a catastrophic failure in a .223 chambered rifle.

As far as steel ammo is concerned,it is a matter of preference. If your rifle will eat it, it should not be a problem. You will hear many people say it's crap and just as many people say it's just fine. It is really up to you to decide.

EDUB

ETA: In the graphic above the critical difference in chamber geometry is the .0427 taper in the 5.56 chamber vice .045 taper in the .223 chamber.That angular difference results in 25 thousandths difference in freebore (less in the .223). The steeper taper in the .223 chamber prevents the bullet from setting as deeply in the chamber when the primer ignites and before the powder ignites. This reduces the volume of space behind the bullet and causes the pressures to rise to unsafe levels.

Read this for a more comprehensive explanation

http://www.m4carbine.net/showthread.php?t=94

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Last edited by EW1066; 08-25-2011 at 03:54 PM.
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Old 08-25-2011, 05:11 PM   #5
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As has already been stated, one of the only exceptions to this rule is the Ruger Mini-14 (except the "Target" Model) that is marked ".223 Remington", but states in the Users Manual that it is safe to use 5.56mm NATO ammunition in the rifle.

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Old 08-25-2011, 05:35 PM   #6
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Thanks for in the info. I am planning out my AR15 build and I am planning on getting the 5.56 barrel so I could shoot both.

I saw 223 ammo last night at Walmart 20 for $5 and I know its cheap stuff but it got me thinking.

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Old 08-25-2011, 06:11 PM   #7
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I shoot the SH*T out of $4 Tula and am more than satisfied w/ it.

Get a 5.56 or Wyld chambered barrel and be done w/ it.

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