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I think the 458 3" was made in Africa because powder availability prevented getting 2300 f/s from the 458 Lott with 500 grainers.

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This is my understanding also - for reference, it is mentioned in Kevin Robertson's book "Africa's most dangerous".

What advantage it really offers over the 458 Lott is dubious though, unless you really need 2300fps . The whole point of the Lott was to get a reliable 2150fps without compression and pressure problems associated with the 458 Winchester at the time (which are arguably no longer valid anyway with modern powders).

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