Re: excess pressure?
I start load development by finding MY 'max load' with given components.
This has nothing to do with any load manual or velocity goal.
It's based on max load being a reloading problem, or not.
A defining line.
Bring calipers to the range when working up to find max. Pick a spot nearest the webs that you can consistently measure at(I use the webline ~.2 forward of extraction groove).
As you go up in pressure this datum will step change to a larger diameter that represents chamber minus springback. It'll hold at this diameter for further increments, but at some higher charge will step change again another .0005"(1/2thou). This represents the point of brass yielding and where FL sizing will be required. Barely above this you get popping extraction as the brass is left at an interference fit because the chamber sprung back fully, while the brass did not(yielded).
Primers,,, bolt turn,,, head marks,, brass life,, could do anything, or nothing, through the range -with your action, your chamber, your dies, and what you're willing to accept. Many point blank BR shooters accept only 2-3 firings of brass life with extreme pressure loads. But you can't accept their pressures with hunting cartridges. Too much area for pressure applied. You will run into real problems way lower in pressure.
Your chamber is your best die, and you're sizing in it (upsizing). So this will show any real problems, or not.
That's what you wanna watch.