Finally had a calm morning to shoot a couple patterns of ammo acquired over the winter. Both shot thru my 1300, 22" barrel, GT .655 at a measured 40 yards with my range finder. The 7's put 191 in the 10" circle and the 6's put 145 in the 10" circle.
3-2-7's 191 hits
(http://i794.photobucket.com/albums/yy227/moses25roman/Snapbucket/7f33beea-orig.jpg)
3-2-6's 145 hits
(http://i794.photobucket.com/albums/yy227/moses25roman/Snapbucket/c06e0761-orig.jpg)
open your choke up to a 660 and see what happens it should do better than that