The CIP site confirms that 850 BAR = 12,328 PSI by crushers (LUP) is actually 960 BAR = 13,924 PSI by transducers (
13% higher), and adds MPa to the confusion
“These cartridges, if they are to be fired from standard proof shotguns (ie those proved to 960 bar [13,924 psi transducer] or, previously, 850 bar [crusher]), or magnum proof shotguns (ie those proved to 1370 bar [19,870 psi transducer] or, previously, 1200 bar [crusher]) must not exceed the maximum admissible service pressure of 74 MPa (new units “megapascals”, in place of the old 740 bar) specified by the CIP and measured by means of a piezo-electric transducer.”
