Heck,I used to use 5 yard increments,10 yard increments,halfway and target judging.I would also judge to the target and back from the target.Usually whatever was working best for me that day was what I went with.
When I was doing THE BEST,the target told me everything I needed to know.

This is why most pros have a full set of targets of their own. (maybe I should say 1 reason)