I've used Hornady 195gr or Nosler 200gr AccuBonds for some years now in both my 8X57 Husqvarnas and my Kimber MT 325 and had good results from either.
In my 8X57 I usually load 51gr IMR 4350 and the Nosler AB. It would be a great elk-whacker. I DON'T RECOMMEND ANY LOADS! Work yours up safely.
IMR 4064 is also a great powder for the 8X57, IMO. I'm sure some of the newer powders are better, but I'm well stocked with the old standards.
I normally use 4064 or RL-15 for 150s, CFE223 for 170s and 175s, and H4895 for the heavy stuff.
I'm going to try 4064, 4350, N150 and RL-17 to try and find the best balance of accuracy and velocity.
(edit to add): I just got off the phone with my outfitter. I need to be prepared to shoot up to 400 yards. He says that is uncommon, but possible. So, I may have to take my 8x68s instead.