Primer pic is fine, and looking at these primers I would agree with you, I see no signs of excess pressure in the primer analysis. I use a chronograph for all my testing these days, but I spent a couple of decades without one, and got pretty fond of primer analysis for evaluating rifle loads. Even with the chrono, I still do constant primer analysis as an extra data point and reality check. Old habits die hard I guess.
I'm agree with everyone else who has suggested case head separation is most likely from too much head space...thanks for posting the picture...
Jeff