Sorry, but just because a projectle passes thorugh an animal doesn't mean it's better than one that doesn't. If it hasn't expanded and dropped most of it's energy in the animal, it may well not have done as much damage as the projectile that didn't exit. If it did, then yes, two holes are probably better than one. It sounds as if your not searching too hard after the hit was more the problem than the projectile not doing what it was supposed to.