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Perhaps ... but how this happens still befuddles me. I find it hard to believe this happens with no barrel obstruction.

This one happened in the last week or so.
It's happening because there is still a bunch of stainless barrels out there on Sako's and Tikka's that are defective and overly brittle. The company is dragging it's ass finding the people they sold them to. Seems they are more concerend about keeping this quiet than about the potential danger to their customers who are shooting this bad batch of rifles. They have a recall on them yet they don't advertise it or even have it on their website. Can't respect a company that operates like that.