sxsman1 - OK, you have some interesting patterns to work with. Here is a method that will help you learn something beyond rules of thumb. Pick a target and determine the vital area and the number of hits needed. Find the center of each pattern, mark it , and divide the pattern into eight pie wedges. Make an hole of diameter equal to the vital area in a card. Slide the hole down each of the eight pie wedges (outside in) and mark the center of the hole when you first have a count of needed hits. Average the measurement from the pattern center to each of the eight marked hole centers. this number will give you a good approximation of the effective diameter of the pattern. Repeat this procedure at increasing distance and watch the effective diameter bloom and then wither.
The next question becomes how good a shot are you? Well, you now have a basis for deciding maximum range of shooting.
