Some here are firm believers that if you have a problem carrying a heavy rifle, then losing 10 pounds off of your waist is the best answer. Haven't seen any pics of you lately, but last I remember you didn't have 10 pounds on your waist to lose. Sooooo, maybe you should think about shooting smaller Bulls, which would knock more than 10 pounds off rather quickly. Then you could carry a heavier rifle, that will allow you to shoot better, which will allow you to kill them deader than those in the pics.
Us day-hikers are up on the logistics of rifle weight....