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I think the proof test of the Brits is at the much lower 80,000'ish psi which most/all US manf do with their actions.... why it looks like your brand new rifle has been shot. It has...
This doesn't break anything but ensures their butts are covered in case there was a flaw in the part.
I am refering to the design proof where in a lab, the actions are tested to destruction. If they cannot meet a 120,000psi threshhold (or thereabouts), the design is rejected. This is to ensure consumer safety wrt to a catastrophic failure. They will also confirm proper gas venting and the like.
No action can be sold once exposed to this level of pressure... strictly in the lab as a proof of design.