I use a 7 mm mag with 150 gr. Sierra Gameking BT and through a chrono I'm just over 3000 fps. I always choose the chest shot going for the lungs and heart. I have never had a pass through with one of these loads and I have harvested more deer than I can remember with this load. I wish I had some pictures of the bruising on the inside of the hide opposite the entry hole. It is usually a good 6 in.in diameter (I'll have to post some after next hunting season). I believe that the energy is best served in the animal and not with a pass through. Have they always dropped on the spot.No, but they haven't gonetoo far although I've had some big bucks run 50 to 75 yards without a heart. I suppose the adrenaline that is pumping through them during the height of the rut has something to do with that. They are basicly dead on their feet. If I can't make the shot that I am sure of then I don't shoot. That is the best way of ensuring that you are notonly wounding the animal or that you have to track them for hours.