Do these marks look like overpressure? I have them on several pieces of peterson 6.5 CM brass. I didn't see it when I was shooting - I just noticed after a clean and inspection. I did have a small amount that were .2 over max but I have these marks on many more that would have been under max. I also noticed it on a factory hornady 147 ELD-M although to a much lesser degree.
Edited to add - rifle is a Tikka T3x bolt action in 6.5
Edited to add - rifle is a Tikka T3x bolt action in 6.5