My experience since moving to custom actions and tough brass with small rifle primers is that looking at the primers doesn't tell me anything until it's too late. I find bolt lift to be the best indicator now. Safe loads extract like they went in: smooth with no effort.This is a close up of the cratering with 49.0 grains of 4350 with the 250 A-tip. Too much powder and actually difficult to bullet seat. Over pressure, but probably not quite meeting the expectations of pressure signs for that load, at least mine. Some of my rifles show similar cratering with factory rounds.
The plunger circle is apparent. It’s something of a biased indicator because a lot of bolts don’t have a plunger hole, but would leave that mark if they did, with the loads run.
I'm really interested to see if you find a good node at an achievable speed/pressure. I'm thinking about how Dashers can push 115gn bullets pretty fast, but no one really runs them because the node the Dasher likes is low and the next good node is too high to reach. 6XC gets the 115 to the higher node, so that's become the known go-to.