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Go back up to my post #14, and follow the second link to read how CHE (Case Head Expansion) corresponds to pressure. It is remarkably inconsistent even with cases all from the same lot and with the same load history
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Reading primers, casehead/extractor groove expansion, extractor marks and many more, are a bit like reading tea leaves. At the margins there is simply a lot of variability....too much to say 0.001 vs 0.0015" growth means max pressure. Or that flat primers always means "insert meaning here".
By the time they are definitive, you are probably well over max.
I had some over pressure going on a month or so ago and the casehead grew by 0.015 and was stuck. That's definitive. But there were other signs as well like the primer falling out.
We do what we can without fancy pressure equipment, but I wouldn't put a lot of faith in any one observation.