You mentioned Federal Heavy weight shells. Be aware that those shells use a flight control wad that is not intended for use with ported chokes or chokes that are designed to strip the wad away from the shot. It's not a safety issue or anything but you won't get the patterns you are looking for using the wrong type choke with those shells.

You can spend a lot of money tinkering with different stuff and each gun is an entity unto itself as to what it shoots best. But I'd bet you dollars to donuts that if you just went ahead and got some Hevi-13 6's and your pick of an Indian Creek, Hevishot, Rhino, or Jellyhead choke you would be so pleased with the results it would save you a lot of experimenting and maybe even money in the long run.

For Federal loads with the Flite Control Wad

Trulock unported .650 Precision Hunter

For all other loads

Primos Jellyhead .660

Gman

I would recommend the HeviShot turkey choke. I shoot an SX3 and when I went from the factory tube to the HeviShot tube my pattern tightened up a good deal. I shoot the Hevi-13 in #6 and have also used the Magnum Blend, both pattern well.

Thanks for all the responses. I'm going to see what the factory tube can do with Hevi13's and go from there. Maybe I can save myself some coin.

I don't know if I'd use the factory choke with hevi shot unless it says on choke that it is rated for hevi shot...

I would just shoot copper plated lead threw it...

X2 Sometimes youll be surprised.

I shoot that rig with a HS undertaker hevi shot tube and it patterns great!