Originally Posted By: chrome/22
So when you fire a NATO/ 5.56mm round in a .223 chambered rifle the reaction is a bit violent?

I can understand that as it's a hotter round with slightly different dimensions.

From my research the RRA I have is the .223 Wylde.


c/22

I don't know if you'd get a KABOOM, but you might see the classic over-pressure signs or possibly get a stuck case.
.223 chambers are usually found in bolt guns while most all modern ARs are chambered in 5.56 (some are .223 Wylde)
With the popularity of these cartridges, it is important to know that the chambers are not alike and the cartridges are not "the same thing".

In the AR community, probably the biggest problem with .223 is that some of it is very weak and will not cycle a weapon set up for full power 5.56
You can tune them to run crap import ammo, but you don't want to test a new rig with crap ammo. Use full power Lake City 5.56 and get it running with that.

Chamber Comparison

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