RE: Choke/Shell advice
My 835 likes the Pure Gold Turkey choke with 3.5" Win Supreme Elite#6s. That and the Fed Heavy weight were the only 3.5" high density shells mine would shoot decently. It didn't care for Hevi or Hevi 13 at all, which I thought a little bit odd. Most guns don't shoot 3.5" shellsworth a lick anyway, but I think the 835's overbored barrel is what really sets it apart.
As far as lead goes...mine liked the Winchester's the best...seems that every turkey gun I have ever used prefers Winchesters. I am thinking about going back to using just lead instead of High density stuff...but who knows...I still have a few weeks to play with it.