Re: DPMS LR-308 beating up brass.
Post a picture of what you're brass looks like.
What it SOUNDS LIKE, just by reading...It's nothing abnormal and it's not really "beating it up"
A ding in the neck is nothing to be concerned with, your resizer is going to handle that anyway.
I'm not sure how your extractor could be getting anywhere near the bottom of your case.
If it's leaving pull marks on the back of your rim, then that would be a pretty bad deal...but that's unlikely. Your dented necks are probably just from hitting your case deflector. You can fix that in a number of ways
"We do not rise to the occasion...we fall to the level of our training."