There are plenty of good calibers for your job.
Just as a suggestion for calibers, without knowing your other guns currently owned, I'd throw out .243, .257 Roberts, 250 Savage, 25/06, 25 WSSM, .260 or 6.5 X 55, 7mm/08, .270 and 7 X 57, and even a 300 Savage all will work and with manageable recoil as long as you can shoot the distances needed.
You don't need a magnum for antelope but of course they can work just fine. 6.5 Remington Mag or 240 Weatherby would be flat shooting picks, but recoil or comfortable rifle weight might make them ungainly to carry around on an antelope hunt.