Wow....if youre firing brass that looks to be ringed like that..you are pushing it...looks like it is cut at least 1/3 of the way into the body.....if it doesn't look like that before firing...definitely need that chamber rehoned....your brass is all going to be ruined.....if you look at the piece to the right you can already see it bulging at the cut area.....run your borescope in there...show us the body area at the problematic area.....
I wouldnt waste any more brass til it's fixed.....money down the drain...