As a mathematician, I would argue that the difference in average is negligable. .4 of a bird is 1 bird every 10 rounds of 25.
But how would you argue as a top class skeet shooter? 10 rounds of 25 may equal a 250 target event! Now I don't know much about top class skeet shooters, but if they are anything like top trap shooters I know that competion near the top is tough and often close. I would say that one target is mega big.
No matter what gun you used, those averages show that you are a very good skeet shot