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not sure but i think they are proved at 2500 bar.

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Actions aren't proved. Barreled actions are, and no shotgun is proved at 2500 BAR. Very few are proved for half of that. A .470 has a max pressure of 2700 BAR, or 39,160 PSI, which requires a proof pressure of 3375 BAR. A full nitro like the .470 on one of these actions is a poor idea.

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"Serious rifles have two barrels, everything else just burns gunpowder."

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