stringtalker, I have the same gun. I bought it for my grandsons. Liked the 20 so much I bought me an SX3.

In that CVA, the factory choke gives me 140 or so in the 10" circle at 35 yards using Federal HW 7's. I didn't shoot 40 yards because I didn't want the kids to shoot quite that far.
But if you are looking for a tighter load or a 40 yard pattern, I think Sumtoy has that load figured out in 20 gauge.