I know plenty of hunters here who have taken elk with .7mm-08 factory loads. Same goes for the .270 and the .30-06. There seems to be a general feeling here that more elk have been taken with the .30-06 than any other cartridge. It's all about shot placement.

As for the .300WM, I have a buddy who hit a big Muley buck at the base of his skull across a canyon (maybe 400 yds.?) and pretty much blew his head off. That's a lot of juice!