I guess I assumed you read my post. I have hunted, guided, and outfitted the Idaho backcountry for over 30 years. I can not say exactly how many elk this cartridge has killed in large body mule deer and elk over those years but it is fairly high. I have not killed all that many, perhaps 10, with this rifle because I primary bow hunt. I have killed 15 bull elk with my bow. Which brings me back to clients and outfitting. 270's and 3006 are common but the magnums are more popular these days with heavy brakes. My buddy and outfitter uses a 3006 and has quite a large collection of large bulls that he and his wife have killed, going into the 350 plus range. For Idaho that is a large animal.
To your point is a 300 WM better, well of course, is a 338 better than that, well of course, is a ....... We are only talking about a 500 yard shot on a Cow Elk. Put that bullet in the right place and the estimated 2066 fps and 1705 ft lb of energy is going to do quite nicely. (@5000 feet, 40F, horizontal, 80% hum, .500bc) Do I have real world experience, yep, many many many times over. I am by no means a ballistics expert so feel free to educate us with examples etc. I am all for learning something new. I used to think and still kinda sorta do that a 270 is a wussy rifle. I thought the same of a 7mm-08 until we tagged a large muley a few years ago at 354 yards. He went 15 feet, DOA, complete pass through, excellent expansion.