Over the top 3 or 4 blade mechs with 1.75" or bigger cut. Head loppers obviously work too.
In my experience, the broadside stutter above has the shot placement pretty high. It's spine at best, feathers at worst. When I was first starting to bowhunt turkeys years ago, I shot feathers a lot from aiming too high. With a big broadhead, I have had a lot of luck taking out the legs broadside, and busting the spine on rear and frontal, everything else is kind of a crapshoot. I don't personally like head loppers, but I do like that they are clean miss or dead right now.