It never fails to amaze me how tough big game has become over the last 45 years... or at least how tough they seem to be perceived to be. IMO one doesn't need a magnum anything to kill elk at 500 yards. I wouldn't hesitate to shoot a 7-08, given a good shot angle, steady rest, and a 150-160 grain bullet. After decades of hunting and guiding hunters in western CO, and going through a bunch of different magnum rifles personally, from .270 WSM to a .300 Jarrett slinging 200 grain bullets at 3030 fps, I've seen that the .270's and '06's we used when I was a kid are still plenty adequate. I'll be using a nice, lethal, .284 this fall. The big magnums are great for brown bears and long, long range hunting, but unnecessary for 500 yard shooting... that's assuming one can hold something like MOA at that range and place bullets where they need to be. And I don't take marginal shots, even with a magnum.