If you had kept each load segregated , you'd know which load or loads were the culprit ! Throw out the brass with the distended primer pockets , and start over , if those Primer pockets stretched that much , the primers must have backed out to some extent and were probably readily apparent ! Keep your brass seperate for each load , all the way back to the reloading bench for final inspection . I'm sure your problems have more to do with charge weight , than primers or anything else !
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