@BlueDot37,

Sounds like reading primers like a pro comes with experience. I can read them some but don't know all the things to look for to tell whether what I'm doing is good or bad. I know that if I get powder burn leaks through the primer, it's over charged, or if the firing pin hits the primer and makes a oblong shape it may be a little hot. Also, of course a protruding primer is over charged.
May be off on some of those assessments but I got a feeling that's not all.
One of the things I recently learned in addition to the primers telling some information about the charge, is if the case has burn marks down the case, the charge may not be sufficient to expand the case and keep the powder from burning down the case.

Thanks!