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Old March 12, 2014, 06:51 PM   #3
jmr40
Senior Member
 
Join Date: June 15, 2008
Location: Georgia
Posts: 10,786
223 and 5.56 are 2 different names for the same thing. Military rifles are usually designated 5.56 while civilian versions are typically stamped 223. You will never have an issue in your bolt rifle using either. Some guys get all worked up because some Military 5.56 "can be" loaded to slightly different specs. What they don't realize is that if you walk into any gun store and pick up several boxes of 243, 308, 30-06 or any other chambering from several different manufacturers it too is loaded to different specs that vary just as much as the difference between some 5.56 and some 223.

At times you may find a brand of ammo that may not work well with an individual gun. But the same can be said of any other chambering. They just don't have different names for those. We could easily have 3-4 different names for 30-06 since it is loaded to such wide ranges of pressures and varying guns have such different chamber dimensions. This is actually far more of a concern, yet it doesn't seem to cause any issues. This is usually simply a matter of reliable function in auto's. Not much of an issue with a bolt gun.
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