The simple truth is both are plenty if used within their limitations.
And there-in is my point. Kudo's for you on your .25-06 success. I still say 400 yds (ON A BULL ELK) with your .25-06 is not the right thing for a newbie Elk hunter. However, I doo see where you say cow or small bull up to 400, I suppose that has a better chance for an ethical and quick kill, but remember what I am saying as is the OP, FIRST time Elk hunter
.
I am not in the "break his shoulder bones" camp, I greatly value my Elk meat, I shoot a .270 religously, and as you say with your choice of weapon, I don't have issue with a mature bull at any reasonable range <500. Taken many of them, usually one shot.
But I stand by my words, for a newbie Elk hunter that might have a once in a lifetime shot at a big bull, the 25-06 is not the best choice. As I view the .25-06, energy is not as bad as I thought, and in the hands of a
capable Elk hunter, probably is adequate.
.25-06 ft lbs @ 400 = 1298
.270 ft lbs @ 400 = 1428
.30-06 ft lbs @ 400 = 1601
No, Elk are not armor plated, but if you think they are soft, you are fooling yourself.
Don't mean to hijack your thread BPhunter, I am just giving MY opinon so that you might have the benefit of my personnal experiences and have the best chance at a wonderful hunt and trophy of a lifetime and not have the catasthpohy of a poor shot with not the best caliber. (I used to guide Elk hunters in my younger days and know your situation first hand - New Elk hunter - Not enough adequate Gun)
Again, Safe hunting and good luck to you!