RE: 40 yard shot
i think that a deer at 40 yards wouldnt be as likely 2 jump the string as a deer at 20 yards away. this is b/c the deer is father away so the sound is not as much of a threat as the sounds would be at 10 or 20 yards.
elkcrazy is right about the stick though.....so just make sure u have a couple of clear shooting lanes