When I was growing up if anyone would have even talked about using a magnum anything for Elk or deer they would have been laughed out of the woods. I watched over they years as the trend changed, mostly due to poor shooting.
I recall many of guide trying to get the gun guns outlawed because they were not as effective and people simply couldn't shoot them well. With poor place shots folks proclaimed then needed bigger guns. I recall one person giving another a 243 to use for deer hunting. Years later asked how he was getting along with it his reply was that he killed 12 elk with it before someone told him it wouldn't work and he had to use a bigger gun. All 12 where one shot kills.
I've done a bunch of research over the years and I think folks might be surprised to learn what the most effective caliber is fro deer and elk. It doesn't start with a .3 if that helps any.
I personally think it was a great shot from a great coach that had a clue.