Re: accuracy of 223 Wylde vs 5.56 NATO chamber
They both suck.
I ordered a custom reamer from Manson based on 223 Rem SAAMI, but .250" neck [no turn] and .030" shorter throat. Built two rifles with Douglas 1 in 16" twist barrels, and both shot sub moa.
My factory rifles with NATO chambers are stuck at 1.05" 5 shots at 100 yards, and can never do any better.
Carbon?
Try blue Dot.
It will not cycle an AR.
Shoot the AR single shot at rodents.