Funny thing, I'm right in the middle of load development for my 300WSM. I've have a couple good loads for the 168 Amax and 168 HPBT Hornadys. Right now my friend and I are working on 208 Amax loads. He has his shooting great out of his 300WM and I'm having a hard time getting mine to fly right. We both have 1-10, 24" barrels.
I know you want to shoot 180s but consider the 208s. If you look at the ballistics...wow! They should be great for elk. From my research, I think you'll find IMR/H 4350 or RL17 good powders. RL17 shows higher velocities before you start to see high pressure signs.
If you consider 208s:
Hodgdon recommends starting H4350 @ 56.4 - 60.7 and IMR4350 57.7 - 62.0C.
Reliant (via phone call) recommend starting RL17 @ 56.0 - 62.0
If you consider the 186s, I found two good loads at 64.5 and 66.5 grains of IMR4350 jammed into the lands about .003".
I know you wanted to shoot 180s and I haven't got to those yet but this might help if you decide to shoot something else.
Here's a peek at my field notes. I usually transfer and organize it better when I get home.