Craig, I'm sure you know what you're saying, so I apologize if I'm a little dense. Axial, meaning parallel to an axis, still doesn't tell me which part you're referring to. In the end, it doesn't matter, as I assume you are just referring to 'a part' to scale the barrel wall thickness.
As someone, maybe Drew, said, wouldn't it be great if the original poster just measured the wall.
All that aside, I still believe the failure is due to an obstruction, and a 6500psi cartridge isn't going to burst that barrel by pressure alone.
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