I've used #6 Hevi and Mag Blends and Longbeard #5's. Every turkey I've shot has been dead...
Of course the Hevi Shot is heavier and probably hits harder but within 40-45 yds., pretty much anything that patterns well kills a turkey dead.
It's fun to experiment and it's cool to know you have a little margin for error with Hevi, but, for all intents and purposes, you get the same result. A dead turkey with all of them...AND there's the cost factor...