One very important thing that Ive noticed is the Federals DO NOT like a dirty gun after about the second shot. They also dont like you to leave oil inside the barrel.
William at Sum toy showed me probably the best thing to do. It improved my patterns, even with polished barrells. After shooting 1 or two rounds, clean the inside with de-natured alcohol. Run it through until your patch come out clean. I do it after a kill a turkey now, every time. To me this would be important for the guys shooting the 3U lots. Since they are already 20 to 30 pellets worse per pattern. Keeping guns clean will maximize your pattern. These sub 100 in 10 patterns would be fine turkey killers at 40, but you spend so much on the shells, why not expect the best performance when you know they are capable.
Here is are some dirty 3U lot number patterns. Kind sucks when you know they put up 120 numbers.