Taco, My main aiming point with a rifle is mostly the wing butt. The round ball damages less meat than most realize so a shot through this area is good for the meat hunter.
Depending on the attitude and movements of the bird I might make a head shot from 30 yards in. I've practiced a good bit at 50 yards and feel confident on head shots if I wanted to take one and had a good rest but I like the flavor of wild turkey so if I can't call him closer he gets a shot through the wing butt every time.
My load is a .395 round ball, 60 grains of 3fg, .0175 pillow ticking patch, I get complete pass throughs everytime.
I've been hunting these birds for a long time and they still teach me things every season. The weapon is not the important thing with wild turkey gobblers, it's your woodsmanship that gets the bird.
But it sure is fun hunting them with a flintlock rifle!
Darkhorse