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The .375 x 2 1/2 works quite well in the Martini...I have one

CIP says the 450/400 N.E. 3" is a 2800 bar cartridge, that's over 40,000 psi, not something I would feed as a steady diet to 100 year+ rifle, even a Martini.

The 450/400 is a BN so it might feed, but it's not a cartridge I would shot in a Martini.

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I really don't think there is a problem.
40,000PSI is well under a .303 British's 44,000CUP which is over 50,000PSI. Anyone shooting a Lee Speed or M98, model 88 or M93's through 96's with factory Norma 6.5x55mm through 8mm Mauser? Those are all over 50,000PSI. Note there is a big difference between CIP's PSI which almost matches CIP and CUP and the US # derived by tranducer.

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