I don't have the problem with my sling attached to the Harris, with about 90% of my carry time I support the butt of my 12 pound rifle with my hand. Learned this from a PH in Africa about 25 years ago. Greatly reduced fatigue carrying a heavy double all day. Forget what you see on film, grabbing the barrel with the rifle resting on your shoulder. It's ok for short periods and and looks great for the movies. It will kill you if you are wearing a tee shirt. The technique, with the rifle slung on your shoulder with the barrel up, same side arm straight down, is to pivot your hand clockwise so it is palm out and support the butt with your cupped fingers, taking the weight off your shoulder, but still enabling the rifle be suppoted by the lighter sling pressure on your shoulder. Sling adjustment is important. After doing this for a while, it comes natural and feels like your carrying a lightweight sportier. It solves two problems, weight and balance. For my size and physical make up, using a second sling stud throws a heavy barrel rifle out of balance, for extended carry causing fatigue.