Just bought a new 700 CDL 25-06 and love it. Great choice for Deer and smaller game and for long range varmint. As many mentioned isn't very practical or available if you don't handload. I planned to load for it which is why I got one. .270 ,30-06 , .308 are the most common cartridges for factory ammo and some of the cheapest. If larger game is preferred and you already have a .243 I might consider .270 and above.
Good luck!
Good luck!