If you're me, and it's 1970, you'd have to resort to wildcatting, as I did, with my .505 SRE (570 grain bullet at 2150 fps.). Nowadays, you have quite a number of choices. Perhaps the easiest would be the .500 Jeffrey, which does not require a Magnum length action and is probably the easiest to find reloading components for.
500 Jeffery!
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