I wish I had a nickle for every rooster I shot on a rail road track. What happens is many of the train cans are loaded with grain which is why the pheasants like to hang by them. Also they are often the only source of cover in farm country. Heck Ive found pheasant in the middle of the city along rail tracks.
When I was hunting with this guy
I almost never bothered with the pricey loads. I had other dogs almost as good a Caye too and they pin and put the bird up so close theres just no point shooting with anything but cheap #5 or#6 loads and improve cylinder chokes, or even skeet chokes. Heck I often used 7 1/2 shot when hunting over such an experienced visla at the club I guided him at.
When the pricey loads shine is on late season hunts for canny, wild birds. Most of all if theres a lot of wind. I always kept a box of copper plated #4s around for that kind of hunt.
So if you have a good dog then no, generally expensive shot isnt needed. If you dont have a dog or the conditions warrant it then I'd say yes, spend some money. For Turkeys I'd say buy the best shot you can. Wild Turkey is more like a Big Game hunt cause at most I can get out once or twice a year. Good hunting to you.