all will work in the right conditions. My choice of these would be the 30-06 with a good 165 through 200 grain bullet (Like a Trophy Bonded, Hornady Partition or the like). I dont know what the hunting conditions are like where you are at but open sights or low power optics should work well. If hunting heavy timber keep in mind that black bears, black sites and black forest floors make your target difficult to see, especially at low light. 12 gauge with slugs would be my second choice of the calibers you offer. Good luck on your hunt, no need to buy new or bigger equipment unless you want to.