i hope since you are not getting blood and the deer doesn't drop in it's tracks you still look for the deer as best you can !!! but it's like cayugad said when you hit high it take time for the chest cavity to fill and the fact is you may never find blood at all if you hit lung (s) there will be a mist of blood sometimes heavier than others difficult to see without snow on the ground you have to get on your hands and knees and crawl to find it sometimes?? but sounds like your gun is ok and i doubt your powder is the issue.