Aaaaarrrrrgggghhhhh!!!!!!
I've just been directed to another one. A complete discussion thread were the out of round chamber destroys everyone's Winchester brass. The old Lee Enfields couldn't even pass a SAAMI test gauge when they were new.
This time the offending rifle (No4) actually suffered a case split longitudinally which blew the bolt head to pieces- but nobody on the firing line got a scratch.... There was no obstruction in the barrel, no damage to the bolt body. The firer screwed a new bolthead on and went back to using the rifle.
Well- This sounds awfully like the same story that got around a while back. In the end there was a pic of a failed case provided- claiming to be the one that destroyed (vapourised????) the bolthead. There isn't any pics with the 2011 version, but I did save the pic last time. As soon as I find it I'll add it here and talk about what was worked out and finally admitted to be the truth befind the story....
I'll get back to you shortly....