what mag are you shooting on and what do you have your paralax set at?
i use 10mag and have my paralax set at 25yards. 8 yards is blurred but shootable and all other ranges are clear. some people also bracket using their scope by messuring the target with the dots on their scope. i normally just get down and shoot. each to their own.
i get mixed results from guessing the ranges where as people who bracket can be quite accurate with their ranges.
what scope do you use?