I would just stick with the same load for the sake of simplicity. You would first have to make sure that each load patterned well out of your shotgun/choke (which is not a given), plus I wouldn't want to have to worry about accidentally loading the wrong shell first when i was loading my gun in the dark woods at 5 am. Also, if you are shooting at a turkey and you haven't killed him with the first two shots chances are the third shot is going to just be a waste of ammo haha. You give that old tom two warning shots and you can bet your bottom dollar he is getting out of dodge at about Mach 2! If you bring him down with that third shot you are either one hell of a shot or one lucky SOB, or both!