Odd dent on 5.56 cases.

Did my pics not post??!! I have UNFIRED NATO ammo with the same mark, pretty much takes the ejector/extraction/chamber marks out of the equation. So we still don't have any answer. Except hummer70's theory.

Edit-I'm still not worried about it especially since its mostly berdan primed ammo (which I always bring but usually only shoot when there are brass scavengers at the range, lol)
 
One way to test metal hardness is to apply measured force with a small ball then measure the diameter of the dent it makes. I wonder if that could be a possible answer?
 
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