Well weve all bought bulk brass from Ebay (prior to their new ban) or gunbroker etc...well I got mixed once fire .223 and the lc head stamps wont prime with lee sfty prime. Ive smased several primrs just too get the case out of the shell holder. All other head stamps wotk great. I am using winchester standard rifle primers. Thanx in adance...Again...And im sure there wil be more help needed later...