I am staying with what has always worked. #4 Copper or Nickel Plated Shot.
Remember the old- ACTIV Turkey Penetrators that came in 2 1/4ozs of Nickel plated shot? There is not much flopping when hammered by a Activ shotshell with Nickel.
I still have a few boxes left . Too old though.
Plan on using Winchester Super× in Copper Plated #4s. If it ain't broke-- Don't Fix it.