Good question. I don't know but have been looking for the same info. I hunt in an area where there is a housing development close by and I am concerned about high angle shots. I do know that at 1600 fps #2 steel will penetrate human skin at 146 yards. I also have found that larger steel slows down slower but not significant so I assume 200 yards is a danger zone in general. I am planning to go to #4 steel in this area and hope it will max out within 400 yards.