Well the 338 is certainly capable of hunting up to Brown Bear, assume that is not what you do.
600 yds? That's not so much a cartridge as knowing how to shoot it. Almost all of them will shoot that far and kill with the right loads.
What are you hunting and where? 308 will do almost anything and I assume you don't want a lot of recoil aka a 300 WM.
30-06 with heavier bullets will go easily out past 600 yds (as will 308)
270, ditto, 284 ditto, 260 ditto. The 6 mms will do it fine (not sure on the killing power)
Its more the right bullet for the game, range and its velocity than a caliber
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