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Old November 4, 2021, 02:22 PM   #6
Jim Watson
Senior Member
Join Date: October 25, 2001
Location: Alabama
Posts: 17,650
France is a member of CIP and must follow its specifications and proof requirements.
They may get their proof ammo from Norma but it is not over the counter blasting ammo.
Maximum average CIP chamber pressure for .357 Magnum is 3000 bar = 43500 psi.
Proof pressure is 30% over, 3900 bar = 56500 psi.
SAAMI test methods differ so we can't say we load .357 lighter at 35000 psi, 45000 CUP. But European .357 doesn't seem "mild."

I was not kidding above, a French ammo maker really did tell a US reporter that 50000 psi was ok because it did not last long.
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