In reply to:

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I believe Winchester was the one to decide what the 458 win mag was meant to duplicate, not Mr. Lott! What-cha-thank??????????

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I totally agree.

So, Winchester themselves is your source then regarding which NE cartridge the 458 Winnie was meant to equal?

It's just that I don't recall reading anything from Winchester where they ever claimed that the 458 was originally factory loaded with a 480 grain bullet or where the velocity was 2150 fps.