Winchester HV 1.75oz #6's should give you a good pattern with a choke in the .650-.660 range.
If you dont mind going a bit more expensive an Indian Creek, or Pure Gold choke with Hevi-13 3" 2oz #6's should set you up right.
The Hevi-13 #7's are out now, but I have not tested them enough with a Remington to know what size choke to recommend yet.