VAhuntr -
For a bolt-gun carry rifle 24" is max for me. That's what my Ruger 7mm RM has and it has worked fine since 1982 when I bought it.
Any gain over a 22" .270 depends on how you load them. Whether any such gain is results in a usable advantage also depends on what you are hunting and at what ranges.
I was wondering when you were going to say something.