Of what you listed, the .270Win would be my choice. Obviously a good pack is important. I backpack hunt with a Bergara (light) or a Vorn (heavier).
I have always been a big fan of the .280AI. I just finally got mine together. A Defiance Action, KRG stock and Burris XTRIII scope in Hawkins Hybrids. So I'd be remiss if I did not say get a new rifle if it is not a cramp to your budget. Best luck on the prep.
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