Don't have a .277" anything but do shoot ..264", so a 6.5PRC would be my preference. Already have suitable bullets and powder. My heavy barrel 6.5-06AI needs a sporter-weight buddy. 
Coyote Hunter - NRA Patriot Life, NRA Whittington Center Life, GOA, DAD - and I VOTE!
No, I'm not a Ruger bigot - just an unabashed fan of their revolvers, M77's and #1's.
A good .30-06 is a 99% solution.
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