I have a 300WM that dislikes X bullets for some reason. I have shot a bunch of 180gr ProHunters through deer, moose, an oryx, caribou, wolves, hogs, and more. I stuck with it for a while in my transition from C&C and such bullets. They are very accurate in the one rifle I use them in but they waste a LOT of meat compared to the average X bullet.
As someone said, elk are big. I guess by definition, all big game is big...
