so far ive managed to kill them with a 300 wsm, a 6.5 prc and a 22 arc. all have been very dead. also killed whitetail and blacktail, with a lot of different cartridges, everything from 357 mag to 338 lap, as well as archery. cant say one outperformed the others. A good bullet, placed where it needs to go, gets a good result.
my personal favorite right now is a 6.5 prc loaded with 156 eols, my 25x7prc comes in at a close second, then probably the 22 arc. Honestly though its a bit like asking a person what their favorite color is.