Like nalioth said, they get dented when they hit the top cover or charging handle when ejected.
You could try a few rounds and see where it gets dented, if at all, it will either be on the neck or the side of the case. If it's the neck it should straighten out when resizing.
I've heard of a lot of people having luck with a piece of thin rubber tube that was slit and put on the dust cover by the ejection port.
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