I have got good, usable patterns with the Kicks .690, and the Puregold .680. Truth be told, it is going to be a struggle with factory lead loads to get really great numbers at 40 yards. The best patterns i have gotten were with the old discontinued rem hevishot #6 and a Puregold .680. Now i haven't tried any of the newer htl ammo, so i have no personal experience with it, but by the info posted here, it shoots good. I would try a wadstripper style choke in the .690-.710 range and you should see a real improvement over the stock choke you have. Good luck in your quest, 10 gauges are fun!