Flatten primers can or cannot be a clue. That's a tough call if you rely only upon that sign....and I do not rely only on that. But, if I'm getting a consistent sticky bolt lift, the that is (for me) a for sure sign that I've reached a tad above the max. I will back the load off just a bit until I get no more sticky bolt, and if I'm getting excellent accuracy, then I'm done.
If I'm not happy with the accuracy then I'm off looking for another powder choice, or another bullet choice, or both.
FWIW
Dave
PS...This is assuming all of my brass prep is done in a consistent manner.
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