Another thing that speeds up the possibility of slam fire shots is having crap in the bolt causing the firing pin to sit forward and strike the primer when the bolt closes.
The steyrs had the issue with some rounds cause of sand and shit in the firing pin hole in the bolt. Would be much the same for any rifle with a floating bolt. Caused some scary UD's for some people. But then they had some soft primers as well which didn't help. And that was a few rounds in a batch of tens of thousands.
But without photos and checking batches of primers it could be a freak occurrence. I've never had any problems with any primers.
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