Every Elk I have seen shot was shot with a Ruger stainless m77 300 win and all of them stopped in their tracks, some of them it didn't kill them right away but none of them could move more than a couple feet with out falling back down. I shot my first (and only) elk(6X6) with a 300 winny with a 180 grain winchester factory load at about 175 yards he dropped in his tracks didn't move at all until we got about 50 yards from him then tried jumping up and could only move a couple feet before he dropped again, I shot him while he was facing me and slightly quarting away, the bullet went in hit his shoulder totally shattering it and kept going back lodging in his back hip, one more shot to his neck and he was done, this year I moved to a Ruger m77 338 win, I have done reloads using 225 grain Hornandy SST's with 68.5 grains of IMR 4831, the groups these things shoot are insane, I have yet to shoot anything besides a jack rabbit at about 250 yards when I was out shooting this last weekend weekend. I would highly recommend the 300 win or the 338 win mag.