I would be scared to even try to guess how many Elk have been killed with a .30-30 between 100 and 150 yards. If you do the math, at what yardage does a .300 Win mag become a .30-30 at 150 yards? You do not need the monster cannons to harvest Elk. Having said that, I hunt them with 7 RUM.
I shot one at 715 to 720 and it dropped like a ton of bricks fell on it.