Originally Posted by Mikecr
He would have every pressure sign known with a 280 at 85kpsi & the subject would be all together different. That's not what's going on, and it doesn't seem to me like a real problem(so far).
Could be. There is one other cause of "ejector marks."
If the bolt face is not square with the chamber axis, the first time that load's fired in a new case will press the case head against the bolt face fairly evenly all the way around at peak pressure. And if the case wall thickness ain't even all the way around, some stretching on the thin side will also happen more so than on the thick side (cause of banana shaped cases?).
Resizing that round won't square up its head. When it's reloaded and chambered again and its high point on the head aligns with the high point on the bolt face, a shiny mark happens there due to zero head clearance of the round when chambered. But it's isn't noticed until after the round's fired and ejected.
So pictures of the actual case head will help. If the mark's the same shape and position on the case head as the ejector's hole in the bolt face, it's probably pressure. If that mark's just a swipe of brass against metal, it may be something else. Using a high magification loupe or glass to inspect the case head will reveal if the case head is higher at the mark compared to the rest of the case head.