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Old 09-10-2013, 5:43 AM
The Bubble The Bubble is offline
Join Date: Dec 2012
Posts: 339
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Easy one.... Throat specs are different, 5.56 is generally light AP, the 5.56 has a little more powder, and from the technical point- the 5.56 exerts 15,000 more PSI on average than the remington 223. In lamen terms, a chamber spec to 5.56 will be cut slightly different but will be able to handle the hotter round. A 223 camber CAN hold 5.56, but in the long run, why risk hurting yourself and others around....

The rifling choice is dependent on what weight round you will be using.
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