kinda weird i load a lot of 22-250 an use RCBS 10601 fl die set an have never had any problems (just a thought) but something could havebeen in the caseor did you pull the lever down to fast with the case off set an not in the holder all the way.I don't think it was the holder itself you said you allready did 8 or 9 cases
but in any case its nice to know RCBS is on the job an were fast to send you parts gota love for that