My current favorite is this Lilja barreled 6.5X284 built by Dan Coffin. It took 3 antelope, a mule deer buck and this elk plus a few coyotes this last year in Wyoming all via 140 AMAX.
[Linked Image]
[Linked Image]
[Linked Image]

I'm also fond of this 20 gauge shotgun (Yes, I realize it is not a rifle) but it has killed every species of upland game (except snowcock, and that ship will sail soon) and all but the most obscure species of waterfowl in the intermountain west.
[Linked Image]
[Linked Image]