I'm gonna go ahead and post this just to prove a point and I'm not saying I would do it. Conditions would have to be perfect. But this will better illustrate my point to you about shooting a turkey with a legit enough 40yd pattern to kill one in all probability at 75yds. This would be what I would want my pattern to look like. And this is not my pattern, but a buddy of mine(Walter), who I talked to recently on the phone shot this awhile back out of his Moss 935 and Star Dot .676 choke using TSS #9s 2.25oz at 40yds. These left the muzzle at around 1125fps. Now if you know anthing at all about TSS #9's it will penetrate sheet metal at 40yds on most of the shot. Lead 4's won't penetrate it on any of the pellets. There's 465 shot in the 10" at 40yds. Walter is a pretty smart guy. He also knows his chokes.
Now doing the math we would approximately get 365 at 50yds, 265 at 60yds 165 at 70yds and we will just call it an even 100 at 75 which would be a little on the low end of what it probably would be. But nonetheless, I showed you, the original poster this only to educate yourself on what kind of pattern you would need to truly have in a perfect scenario and I don't recommend it, a 75yd turkey killing pattern. And yes those TSS 9's would slice right through bone at that distance. But again you have to center that main 10" pattern over the head and neck of the turkey. And this was for illustration purposes only.