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Originally Posted by tahunua001
many of the differences between 5.56 and 223 have become completely overblown and really only came about with the introduction of the internet. I have never once seen a confirmed case of 5.56 destroying a 223 chambered rifle.
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While I agree with this statement, I have also seen plenty of evidence that shooting a 5.56 in a .223 barrel can produce higher-than-optimal chamber pressures. So, while it's probably not a big deal and it most likely won't cause a kaboom, shooting lots of 5.56 in a .223 rifle might cause more wear than if you just shot .223.