I would also like to know more about this latest incident. It has been reported here that it was a factory Winchester barrel, so presumably proofed. Was it a nitro proofed? Scary if so, because I would trust any factory or proof house tested barrel more than the "unknowns" we have been discussing. I suppose you can blow up most things with a bad enough mistake, but the idea of using better actions, barrels... is to create some margin for error.