Kraven,
Just a thought, I got tired of turkeys walking through my pattern years ago and started playing with every load I could find. Finaly I decided on the load that I've shot for over 10 years now. Its going to sound kinda weird but I shoot a 3" 2oz load of copper plated 7 1/2's through a xxfull choke and have not lost a bird or missed one in that 10 years. From 10 yards to 45 yards it just kills them dead and will fill in the holes in your pattern.
I buy them from Cabelas, as that is the only place that I can find them ready made. You should try this load, I think you will be suprized at how affective it is. I shot 3 shots last year and killed 3 turkeys from 18 yards to 35 yards and there was no question about performance.
Good luck in your quest to find the load you like.
Dic