Lots of good options and it depends on your hunting style.
Spot and stalk, look at the AR-15 in 6.8 or 7.62x39. I use a 6.8. The .308 in AR-10 is good as well but can get heavy with a full mag and optics.
For regular blind hunting, look at the .270 in a bolt action. Good luck and welcome to the forum!