"The shoulder" is a large area consisting of the scapula and a series of bones that run down and forward and then down and back and then finally hook into the legs. Hitting the scapula is one thing but I don't think many people could hit that series of bones running from it down to the leg. Such a shot at range would be luck for most people. The other part of the shoulder is shoulder muscle only. This is what you are most likely to hit if you take the non-scapula shoulder shot. I have no idea how effective hitting that muscle is as compared to hitting the lungs behind the shoulder.
