You got 301 hits at 30 yds...shoot another one and compare...then shoot a 40 yd. and compare. You will have an idea by then. 300 hits at 30 yds dead bird every time no matter where the 4 quarters line up, but 40 yards won't be that many and I would want to know where they hitting and how many in that 10" circle at 40 yds. Just me but others may be different....plus, as others have said each shot at given distance will always be little different, and you will have a better idea with more shots.