Go big or go home.
I'm sure there will be lots of posts that a 243 can do elephants but I for one would be much more comfortable hunting elk with a 7mm over a 6mm any day no matter how much powder was pushing it. Just my opine and it's free so you know what it's worth.

I am continually astounded at how quickly people make up their minds on little evidence or none at all.
Jack O'Connor