I shoot 85gr TSX, also awesome! the .243win I believe tends to have higher BC's than the .25-06, but the .270win probably beats both I'm not certain.
I was gonna say get a .243win, but a 25-06 and even the 270 are all great options.
could always get a 6.5-284 Norma w/142gr bullet, possibly from Savage if you want high BC's and wind bucking!
It was funny, last time at the range in WY before antelope opened, 3 of us were there, all getting ready for antelope, all shooting .243win!