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Old 03-25-2013, 02:22 AM   #21
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Here's a article explaining the difference



http://www.americanrifleman.org/m-articlepage.aspx?id=5033&cid=31

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Old 03-25-2013, 04:51 PM   #22
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I can't believe that some guys (even handloaders) can't see the problems that a 5.56 military round might create in a sporting rifle .223 Rem. chamber. Notwithstanding the pressure differences, the risk of a bullet being pinched overly tight by a case that is jammed into a chamber that is too short is one that should be appreciated. A person that has the time could pop the bullet out of a 5.56mm military case and trim it to correct length. I personally would remove the primer puncher from my sizing die and re-size the necks too. Why Remington standardized on a minimum (at best) case length who knows.

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Old 03-25-2013, 05:33 PM   #23
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Quote:
Originally Posted by rjd3282
Then there's the people that say the 223 chamber has a shorter throat and it causes the 5.56 ammo to spike pressures. Again demsionally the same so if it doesn't spike with 223 ammo I don't know how it will spike with 5.56.
The chambers are *not* dimensionally the same.



These differences *can* cause problems when 5.56 ammo is fired in guns chambered for .223 rounds.
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