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John: The 1954 British Rules of Proof refers to that number as "Highest Mean Service Pressure"
The terminology and numbers changed when Great Britain adopted the Commission Internationale Permanente pour l'Epreuve des Armes ŕ Feu Portatives transducer (no longer crusher) standards in 1989
The CIP transducer “Maximal Statistical Individual Pressure” is 850 BAR = 12,328 psi for a “Maximal Average (Service) Pressure” of 740 BAR = 10,733 psi.
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