I sighted in the red dot on my wifes 500 super bantam. She is shooting 20ga hevishot 6's through an undertaker hevishot choke. After I sighted in the gun she took a shot to see how she did with the red dot. Her shot was at 38 yards and she got 138 in the 10 and 145 in the 20. Pretty nice pattern for that little 20 guage.