I killed two big does this afternoon with my .243 and 100 grain Federal factory loads. First one was 285 yards behind the shoulder. She ran 50 yards back into the woods, left not a drop of blood on the snow. Second was approx 100 yards behind the shoulder through the lungs. She ran 30 yards back into the brush. Again no blood on the snow.
One thing I have noticed with new snow a lot of times a warm drop of blood will drop into the snow not leaving a visible trail on top. That said with snow to track with a visible blood trail may not be a big deal.
Snow can be particularly handy when using a small bore. Though in an area with many deer and many fresh deer tracks, staying on the one you're after can be a challenge.
