Re: 5.56 Question.
The 5.56 was developed first, and has very slightly different specs and pressures than the .223 Remington which was brought out commercially based on the 5.56, later.
Kinda the same thing as the differences between 7.62x51 NATO and the later .308 Winchester, although not as big a difference. AND backwards...a .308 chamber WILL handle a 7.62 NATO round, but a .308 should NOT be fired in a NATO chamber, like an old Spanish 1916 ".308 Mauser" or an Ishapore MK 2....
The 5.56 chamber specs are a VERY little bit bigger than the .223 to chamber any military ammo by any manufacturer, and it became even more important when it was adopted by NATO, now there was even more differences between countries of origin, and all rifles had to chamber anything available in 5.56 NATO.
The .223 chambers are "tighter," if you look at SAAMI specs, and some very slightly oversize military rounds MAY develop excess pressure in a .223 chamber.
While I know guys who claim they shoot milsurp from all over the world in their .223 bolt guns with no problems, I wouldn't chance it unless a SHTF emergency hit....
But Rock River and Les Baer and others are offering ARs chambered in ".223 Wylde..."
This is an old wildcat based on the same .222 magnum case that the .223/5.56 was based on, a little tighter than a 5.56 but not as tight as a straight .223 chamber so it still should shoot both safely, but with a slightly better potential for accuracy than a straight 5.56 chamber.
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Last edited by polishshooter; 09-06-2012 at 10:58 PM..