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I think what your looking for is the 400 Jeffery's is the equivalent of the 450/400/3" without a rim. the 450/400/3" is a rimmed cartridge.

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Sort of.
They use different diameter bullets - .408-.410 for the 450/400 3", and .423" for the 404 Jeffery Rimless.
The 404 was developed as a comparable rimless version of the well proven 450/400 3" for use in bolt action rifles.
I don't know why the 404 was designed with a .423" bullet but I suspect that it was actually developed in Germany and swiftly adopted by Jeffery as their proprietary cartridge much the same as they did with the .500 Jeffery later on.

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