There are in fact other things that can cause a gun to blow up other than a double charge.
I would bet that most are caused by a double charge.
Double charge is also the easy scape goat.
But it is also likely to blow up a gun with a under charge in a big case.
Instead of burning in a controlled fashion. The whole charge can go off at once causing a sever pressure spike.
Just some thing else to keep an eye on.
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