You may be hitting slightly high. Exit wounds are typically larger and bleed more than entrance wounds. The blood from the wounds initially doesn't come from the internal organs, but from vessels near the skin, just like you bleed when you get a cut.Individually, thesevesselspump a lot lessvolume than the onesrunning to the heart and lungs. So it takes a lot more surface damage to get enoughblood flowing toleave a reliable blood trail. Entrance wounds punch a hole usually only slightly larger than the diameter of the bullet, so bleeding from the vessels near the skin is minimal. Blood won't really start coming out of the entrance wound from the internal damage until the chest cavity fills up to approximately the level of the entrance wound. The higher up the shot, the longer it takes and the more blood it takes to fill the chest cavity before blood starts flowing out of the hole.