Shot placement is everything and with a good stout bullet,there is little difference at all in killing power of Deer and Elk cartridges with the same hit given a proper bullet is used.I have seen Elk killed with the 22-250 and a hole host of small leverguns.A good shot and a boolit stout enough for the caliber to get to the vitals and you have a dead animal.

Most of the folks in my parts have not fallen for the Ballistic hype and the new cartridges.Seen Elk take several hits from a 7mm the 30-06 also and the old 30-40 krag but in every case it was bullet selection or lack of.
I don't believe in numbers but I do in food on the table and what works and that includes alot of calibers but I do believe the 30-06 and its offspring is never a bad choice with the right bullet.

Jayco