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One thing nobody has mentioned is the possibilty of the neck being too long (case OAL too long) which would cause the bullet to be pinched into the neck when chambered. That would def cause an overpressure condition.
What are the chances that round had a magnum primer rather than a normal primer? That could also cause an overpressure condition.
Excess headspace does not cause excess pressure but it can cause the case to rupture. This issue was clearly caused by a massive overpressure.
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