Limited to one rifle/chambering for the world, my choice would be the 30-06.
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First and foremost let me say........ FANTASTIC bull Brad. You can't know how envious I am. I've been applying for our Ark Elk hunt every year since 1998 or 99 whenever it began. NO luck.
I would not argue about the 06 for 1 rifle for the world IF we were limited.
However in recent years I've decided MY choice would be the 7 RM. Not that far apart and they share ammo availability. I prefer its flattER trajectory.