Re: Head space problems
While you seem to have a headspace problem, you also have a chamber wall defect that causes the ring around the case near the base.
I have a 357 cal winchester low wall which has a gouge in the side of the chamber which causes bulges in the fired cases about the same place. I am fairly certain it results from a sloppy job reaming the chamber. You may have to have the barrel set back and re-chambered.
What cartridge is it?