I am impressed by anyone who can shoot a 100# bow, and I am in awe of anyone who can shoot one in excess of 150#. I just can't imagine why a bow that heavy would be necessary or even desirable for hunting. Maybe the 100# for elephant, rhino hippo or giraffe, but 160#? No such thing as overkill, but if a bow is too heavy to be able to get to full draw, is it really the bow you want to be using under real life hunting conditions? Those sound like the old English war bows for casting very heavy arrows long distances. I'm not trying to discourage anyone, I'm just blown away with the thought of actually hunting with those heavy bows that are well over 100#.
Allan