I have a Remmy 870 20 ga. with a 26" pipe.  I thought about trying some of the Hevi 3" #7s.  I thought you guys might give some idea where to start as far as a choke goes with this combo.  I currently have a Sumtoy 562-5, Primos Tightwad .570, and a Carlson's .575.  Is there a choke that usually turns better numbers with this shell than what I currently have?  I am currently shooting the Fed. HWs 3" #7s, but I am getting tired of trying to always having to hunt them down.  Thanks in advance.