Over-gassing/Timing Issues

[Lemonaid]

The pics remind me of questions some have had with cases after sizing, concerned about case head separation. It looks to me you have an bit of frosting from your chamber that stops at the case head as it is mostly solid brass. On highly over pressure brass, the case head can expand but that should be easy to check. Measure case head on unfired brass and compare. I think you would see some obvious pressures signs, ejector marks, extractor marks and primer flattening if were hot enough to expand the case head.