I agree with most everybody.
I have all three and it truly is just a flip of the coin between them.
I would not hesitate to take 308 with 150's to 300yd on an animal that size and the same with my 7-08 and 140's.
For that matter, my 6.5JDJ and 120's will work just fine.
And yes, Dan B has shot a 16" Encore in 416 Rigby shooting a 350 Barnes TSX over 105gr of IMR4831sc- It zips at 2350pfs and will drop even a big antelope real fast!
Anyway, choose one of the 3 and be happy.
None of them are a bad choice.
308 provides you the oportunity to shoot MilSrup ammo cheaply.
Mine shoots if very well. It'll shoot MOA if I do my part. I can't that about some rifles.