You shoot them in the correct place and they will die ,,45, 50, 54,75 don't make no differance ,, Never fail to follow up on a shot ,,, ever,,, no blood what are the tracks telling you ,, the line of travel will also be a clue,,Up/Down hill,,,, Straight line or circling ,back tracking you,, look for all the clues ,,,that is why they are called clues'