This doesn't suprise me, it's happened numerous times to me. When shooting them behind the shoulder there isn't much in the way of resistance, deer are relatively soft and at the range you shot it, the bullet retained much of it's energy. Basically the bullet had no reason to open up, thus you punched a nice clean hole in one side and out the other. Unless you shot low in the body cavity much of the blood just settled to the bottom of the chest and didn't begin to come out until after it piled up. The no hair thing suprises me, but stranger things have happened. The deer was probably double lunged and ran until it was out of air. Of all the deer I have killed with a muzzleloader I have only knocked two off there feet and believe it or not it was with 180gr and 195 gr bullets.