I am a big fan of the Ballistic Tip bullet which is the design/class of bulletas the SST smithbros mentioned. However Iwouldn't suggest it for elk in the 300 wm. IMHO BT's are better left for thin skinned animals such as deer.

I would suggest the same as handloader. You could also try Nosler Accubonds as well in 180 or 200 gr version. Elk are tough animalswhich warrant a bullet constructed to handle the task of getting through the thick hide, muscleand possibly bone to penetrate the vitals. Any of these bullets I would trust to get it done on a bull elk.

Good luck