p. 46 and at the bottom it states Superior Proof with 4 grams Poudre T with 38 grams shot generates pressure of 1208 kg/cm2 = 17,182 psi + 10 - 14%

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Post-1923 a Crowned PT indicated proof at 850 Kg/cm2 = 12,090 psi and (Superior Proof) 2 Crowns at 11,000 Kg/cm2 = 15,646 psi + 10 - 14%

From https://www.shotguns.se/html/france.html

Treble Preliminary Proof is 18,490 psi = 1300 Kg/mm2

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1928 Manufrance Ideal PRESSION 1100 KILOS with quintuple preliminary proof

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