Sbe 2 and sumtoy choke

[Spitten and drummen]

Talked to William at sumtoy today and after the conversation I ended up ordering a choke for my benelli sbe 2. He recommended a 650 . I ordered 3 boxes of heavy 13 3-1/2" 7's . For anyone with a similar setup , what kind of patterns do you think I will be getting. I presently have a 640 and shoot mag blends with no complaints. 40 yard patterns with it is not really impressive. I don't intentionally shoot birds over 35 yards but would like a better pattern in case I Mis judge and shoot one over that. Thanks.