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Looks like a good primer strike so it's hard to say at this point, but the usual culprit is insufficient seating depth. However I've really never known the RCBS auto to fail like that. But did you try firing them a second time? If they did fire on the second try, that would tend to support the insufficient seating depth possibility. But I don't want to blame the RCBS tool since it is certainly my favorite. Keep trying and report back!!
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