Pressure signs

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I will agree it's very hard to pick pressure from the ass end of a case look at the first picture I deliberately overloaded a couple of cases first one I stopped and rightfully so have a look.
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Now if you know anything about a 260 Remington first load is warm , it was a great rifle shot unbelievably well out to1200 yards I would not recommend anybody use loads .

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Trying to read pressure from a primer very hard to do the way I do it is if you can get 7 or 8 handloads out of a case before you need to bump a shoulder you have a good working load .

Looking at the primers for cratering means nothing if there is excessive clearance between the firing pin and the bolt. They will all look cratered in that scenario.