Any specific reason why you are stuck with shooting 4's? If that is your preference I would stick with a more open choke around the .680-.690 range, most 4's in my 835 shot like crap with chokes tighter than .680. The best ones were the JH .690, Wrights .690, and the Kicks .685 (shot more even than the kicks .680). Otherwise I avoid 4's, nothing wrong with them, I just don't prefer them.