Choochooo,
Welcome to Gray Beard Outdoors, First it would help if you could give us an idea what kind of country you will be hunting in. My thoughts would probobly be a 223 as there are more factory loads for it. The 223 will performe in about all conditions and terrain,With good accuracy. There are a bunch of good calibers you can choose from depending on what you want to do. Come back and tell us more about your self and the area you will be hunting in........Good Luck...........Joe............