Posted by k6zrx on March 22, 2012 at 08:02:32 from (67.112.122.83):
In Reply to: OT/gun question posted by mb58 on March 22, 2012 at 07:24:52:
223 Remington and 5.56 NATO cartridges have the same external dimensions, but 5.56 NATO chamber pressure is higher. The chambers are not cut the same, as the 5.56 NATO has a longer leade or throat. So, you should not fire 5.56 NATO in a 223 Remington chamber, but the other way around is safe with a slight loss in accuracy due to the longer throat. Some rifles, such as the Ruger Mini 14, are marked 223 Remington, but the chamber is cut in a manner so the use of 5.56 NATO is safe.
So it is not the size of the cartridge, but the size of the rifle's chamber that matters in this situation.
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