IMO from reloading rifles for a long long time, the shell on the right side of the most recent photo is the one with the highest pressure. That primer was forced back into the breechface and flattened by that breechface. Saw it on rifles all the time. Difference with a rifle brass is you could also measure the sides of the cartridge case as additional evidence of high pressure as well. IMO the overload took the path of least resistance and it appears the metal of the barrel/breech/chamber gave way before the excessive pressure would have pushed the shell back against the left side breechface. Short version of the above is IMO there may have been quite a few over pressure loads involved.

Last edited by tut; 02/05/14 06:04 AM.
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