Noslers would be my pick, I'm kinda partial to'em. At the range you specified, you bout' cannot go wrong.
Partitions or Btips Killed elk for me from a 280 and 7rm.
A 7mm 150 gr. Btip from my 280 even busted a shoulder on the way out of a bull as he quartered away from me at 80-ish yards, do not underestimate the Btips for durability, especially from a 7x57....
160 and a few 175 gr. 7mm Partitions slain many a pick-up load of elk from both 280 and the 7rm. with boring reliability. Weather shots have hard angles, bone structure or just plain ol' classic threw the slats the partition works well.
