Originally Posted by Berto
In rimfires, it's not unheard of for the extractor to set off the primer while chambering.
Any instance where it 'hit' the rim due to being fouled either under the extractor or at the breech face, a jammed ext spring (holding it down) could be enough to set off the primer.
I am thinking similar to Berto........only I suspect the extractor failed first and caused the OOB.
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