RE: Shotgun Patterning
A couple of questions for you? How spread was the pattern at 40 yds? Does your gun shoot point of aim at 40 yds? If your pattern was off at at 40 it might be the pattern is still good but it wasn't on the bird. There is a big difference between patterning difference between 30 and 40 yards. Any turkey gun should be able to kill out to forty yards just to be fair and ethical. If you misjudge a 30 yard shot and he was at forty than you probably have a wounded tom running around. Make sure your gun is dead nuts by shooting a target big enough to hold all the shot pattern. Place a dot on a car window sized piece of paper and shot that dot and 20 , 30 and 40 yards. If your point of aim is off adjust your sights or learn to compensate.
If you go to a 3" #6 with 2oz of shot you should most likely increase your pattern density. What choke tube do you have as well? Try the $20 Undertaker from H.S. if you are not Xfull choked. These tips should help get your gun on target. Let us know how it goes!