I hurt my shoulder shooting bow a few years ago . It was my left shoulder and I shoot right handed. I notice now I have no problem pulling 70 lbs but when I relax for the shot it puts a lot of strain on my shoulder joint. Just the bow pushing back against my arm caused a lot of pain. I just lowered my draw weight to around 60 and It's not as bad. 60 is plenty to kill a deer, my uncle kills more deer than most people I know and he only shoots 50.