Hmmmm. How big is the deer? I'm not really sure. I try to pick out a tuff of hair, a dark spot or even a single hair in the area about 1/3 up the body and, depending on the angle, behind the front shoulder. (quartering away, this distance would be further back than broadside). Focus on that smallest spot I can see, aim, and release.
Remember, CALM DOWN, FOCUS, AIM, RELEASE.