3.5's rarely pattern better,
Whoa now! While I completely agree that every shotgun (rifle too) is an entity unto itself as far as what it likes ammo wise, it simply has not been my experience that standard shells always or usually outpattern 3 1/2 shells. Possible? Sure, and I would never doubt anyone that said their gun shot 3's better or just as good as 3 1/2's. It happens. But my experience however is that none of the 3 dedicated turkey guns I have has ever patterned a 3 1/2 inch shell worse than a 3 inch shell of the same brand. And that covers a lot of different shell and choke combinations.
It's interesting that a 1 1/8 oz #8 trap load will turn a clay pigeon to a puff of dust at 40+ yards.
But it takes a $1,200 Magnum shotgun, shooting $3.00 a pop 3 1/2" loads, out of a $75 buck Kill'm and Clean'm Turkey choke tube, to put one or two pellets in a turkeys brain at the same distance?
Well there are a lot of pellets in a number 8 shell due to the small diameter of the shot. That makes hitting a clay pigeon a lot easier. Clay pigeons break real easy too. But number 8 trap loads are waaaaay under powered to score clean kills at 40 yards on turkeys. You would hit him no doubt but penetration would be pitiful to nonexistent. Also why number 8's are illegal in many places for turkey.
And my favorite turkey gun is a Rem 870 SM I bought at Wal-mart. Hardly a 1200 dollar gun. LOL! But yes I use the denser than lead pellets because they penetrate and pattern way better than lead. And yes I use a 70 dollar Indian Creek choke because it outpatterns the cheaper chokes I tried first.
Two things sold me on the denser than lead shot.
1.) I shot a turkey at 40 yards using a little short barreled Mossberg shotgun that didn't hold as tight a pattern as the 870 I use now. His left side was turned towards me. It killed him cleanly but some of the pellets in the lower part of the pattern struck him in the upper left chest. Those denser than lead pellets went through his chest feathers; through his left breast; through his breast plate; and were lodged halfway through his right breast. Anybody that knows anything about turkey hunting will tell you that kind of penetration at 40 yards is insanely good. And that was with number 6 shot!!!
2.) The second thing that sold me were patterns like this at 40 yards. Below is 183 pellets inside a 10 inch circle at 40 with Winchester Elite extended range 3 1/2 inch number 6's. It will keep 110 inside the same size circle at 50.
As for the recoil? Yeah it's stout. But once my gun was patterned with these shells I never fire them at anything but a turkey. And I have never noticed recoil when I killed a turkey.
As for price? Yep, 40 dollars for a box of 10 is pricey. But even if I limited out on turkeys here in Alabama each year a box of 10 would still last 2 years.