I shoot Federals 3in 2oz 5 shot. 6 shots shoots well from my gun as well.

Your the expert DA!!! Use what you want...

I wish that was true but I am a greenhorn to turkeyhunting even after hunting them of and on for 15 years. I really don't put my all in it and seldom ever go. Maybe two days a year. Seriously, Longbeard I absolutely found myself wrong for expecting everyone to know how to understand what I ment about using the gun I want to hunt with and I apologize about this. I get upset when people comment on other people's guns and I think that is their preference to not be disturbed on. I am all ear's for better calls, ammo, camo, tricks they learned I need all the help I can get on this.

I pattern guns using a beer can on an arrow shaft.

Now that is a great idea, you could even get the right height too.

I would tape or tack up a large piece of poster paper and shoot at a dot in the center of it. Why? That way you can see what your whole pattern is doing and where it is centered. Trust me, not all shotguns throw the center of their patterns in direct light of sight down the barrel. With a small target like a can or even one of those sheet of paper sized turkey head targets it can be hard to determine if that's the case.

Am I correct that you say you are using a fixed full choke? By that you are saying that this gun does not have a screw in choke system that allows you to interchange different chokes. Then I would shoot Hevi-13 number 7's and see what they gave me on paper. You did not mention how long the barrel is but even from a pretty long barrel you will probably not get great patterns out of lead 4's or 5's and maybe not even 6's past 30 yards. Heavy 13 7's are lethal to 40 yards and are your best change to get 80 to 100 pellets inside a 10 inch circle out to 40 yards. If they won't give you a pattern that dense at 40 yards then I'd lose money betting that any lead shot or larger shot size would either.

Todd, The singleshot I have has had forcing cone work done plus my gunsmith put in a thin permanent sleeve in the end that can't be removed. It gets between .700 and .690 constriction or restriction, one of those terms. It shoots 4's ok with like coke can patterns on cardboard sheet at 25 yards but 6's do them up to 30 yards. Thats as far as I tested them, they were remington and winchester 2/3/4s magnum turkey loads.