I will second running it wet and seeing what happens. Do not worry about having it too well lubricated when the gun is so fresh. I run my AR's soaking wet for the first 500-1000 rounds and that seems to work out for me. I would venture an uneducated guess that a weak extractor or weak ejector is the issue like many others have said. DPMS GII, KAK, and LMT are just the few .308 guns that use dual ejectors to get more reliable ejection.
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