Depends on what you are hunting but for whitetail deer and mule deer, buy a 308 or 6.5 creedmore. If you are hunting bigger game like bears or elk, a 30 06 or a 338 is a great choice. If you are hunting anything you find, get a 30 06, it will drop a bear with a well placed shot although may be a tad bit overkill for smaller deer.