I'd go to a .650 to .655 for #6 shot, and a .665 for #5 shot. My son in law has a NWTF 1300 that has a .665 choke in it and it shoots a pattern so tight with #5 shot that I would not hunt with it, a little off one way or the other with aiming and I would miss the turkey. I don't think you could go wrong with a .665 choke and #5 shot Long beard's, if you are looking for a tight pattern.