I have a Pressure Trace II, it is a wonderful tool and told me things that most manuals don't tell you.
Pressure signs are just as much important as to case design as they are to rifle type.
For example, my Win Model 70's hold up well past 70,000psi without ejector marks, flattened primers or sticky bolt lift, but as soon as about 80,000psi is reached, the primers crater badly, still no sticky bolt lift, but well above max pressure. My REM 700's do not handle this type of pressure without sticky bolt lift, ejector marks & loose primer pockets or blown primers. My Ruger M77 will crater primers early on and have sticky bolt lift, my Ruger M77 MK II will not have cratered primers or sticky bolt lift until it blows primers, bulges case heads and has brass flowing into the ejector slot. This has been measured at 100,000psi and no discernible damage has been noted in the action anywhere.
80,000psi is a proof load, so all actions should handle this, however, HOW max pressure is reached in the curve makes a huge difference, which is why proof loads are regulated and that not ANY powder is suitable to do so with.
Anyway, trying to discern pressure looking at fired brass is a huge guess at best, sure, you can SEE flattened primers, cratered primers and ejector marks, but all 3 of these things can occur just from excessive headspace, not excessive pressure, although the latter will be blamed for the condition…
Cheers.