I absolutely do not use any shot size smaller than number 7 1/2 on any bird, even quail or doves. I learned that lesson over 50 years ago. Way too many fly offs due to very poor penetration. And if the bird is close enough for decent penetration they have way to many shot in them. Maybe if I were doing some sparrow control, etc, I would use size 8 or 9.... And, no, I am not a long range shooter, i.e., 40+ yard. YMMV