Have you guys seen this video?
To make a short story shorter: it's a 688 yard Elk kill with a 243 Win., and the Elk never takes a second step. It's just collapses on the spot.
Granted, it's not a factory load, and my 1:10 twist might not shoot that 105 grn bullet as well, but still.
I've been a fan, owner, and shooter of the 243 my whole life. In the past year, I started saving for a 30-06 for hunting here in AK. After seeing this, I may just stick with my 243.