All reasons why I cannot understand how anyone can hunt with a scope with a plex type reticle and capped turrets (the knobs underneath probably not zeroed either). Out to 200 yards, probably no issue, but after that one needs either a graduated reticle or dialable turrets or both...
I also guess that the shooter was suffering from some buck fever and over confident or just a lousy shot. An Elk is a pretty big target, I have held "kentucky" elevation on a 12x12 plate at 320 yards with a fixed 6x scope and shot a slightly bigger than 2" group with a sporter 308. Granted that the drop at 400 is quite a bit more than at 320 and I had been zeroed at 160 yards.
This is why I shoot bergers. Even thoug I'm not shooting a shoulder cannon, just an '06, it still does the trick quick and clean.
The problem with this situation isn't the bullet but the placement. There's not a bullet on the planet that would have helped this guy. Bergers seem to be the most controversial maker out right now, some guys swear by it, others despise them. All in all it just depends on placement.