I finally got to pattern my winchester 1300 with my new .665 undertaker choke I only got to pattern it at 20 and 30 yards (wanted to try 40yds but was too muddy that far back, but will go to give it a try at 40 as soon as it dries out some) but was very impressed. I shot winchester supreme HV 1 3/4oz 5' s and 6' s and Remington Duplex 4x6' s the Winchester Supreme HV #6' s patterened the best with over 50 hits in the head and neck at 30 yards and no gaps in the pattern and at 20yds it left a solid hole the size of a baseball in the tarket. But from this I feel that most likely I will be good to 40yds. But I will get out to test this in the next week or so. With the Winchester Supreme HV #5s I got around 40 neck and head hits with some gaps in the pattern, and with the Remington Duplex 4x6' s I got around 45 head and neck hits with no gaps in the pattern.