When the time comes that my 7x57 gets to be to much for me i have a 250 Savage to fall back on.
I also have a 6.5 Grendel as well as a 223.
but the way the 7x57 works i don't think it will be anytime soon.
I have a 7x57 waiting in the wings that I shoot occaisionally to develope loads for the time the .35 Whelen and Weatherby mags no longer work for my tired self.