I was out hunting with my father and we hadnt seen any deer or bear all year. So we decided to go out at 1:00pm instead of early morning. We came upon a beach tree grove. We were sneaking through it, and we didnt think we would see anything. I was shooting a CVA 50. Buckhorn magnum with a 295 grain hollowpoint powerbelt and 150 grains of powder. I look to my left and saw a black mass. I saw no head or tail. I said dad look a bear. As soon as i said that the Bear looked up at me and was getting ready to run. My father and I estimated that this bear averaged at least 400lbs. I shot right when he looked up and hit him in the lungs because we saw all his fat ripple for the impact. He took of and we searched for almost half a day. He was no where to befound withiin 2 miles of the shot. There was not 1 drop of blood any where. Does anyone have an idea of why he didnt die?