Hey...I saw a few posts about white hair being potentially a bad sign, and it could be. If the shot was downward a higher hit on the entry side would produce a lower exit, possibly in the white. I’ve seen deer hit with a rifle produce virtually no blood especially if the bullet doesn’t exit (and a lot don’t). Follow looking carefully and if that fails go to where you last saw it and fan out going slow looking for blood and or tracks. You got a lot of good advice here but the best is don’t give up. Walk a grid pattern if all else fails. Lastly...look for crows or vultures. They are good at spotting dead deer. Good luck!