For years, I've used my Rem 870 Wingmaster (12 gauge), with 1-oz. of #8 lead shot, through Improved cylnder choke for my New England "patridge". This has been a successful combination for me. For several reasons, I need to switch to steel shot. I picked up some Winchester Xpert #7 steel shot, that is advertised for the "uplands". Question: Most of my shots are on the wing and less than 25 yards. Should I drop down to a skeet choke with the steel shot to keep my patterns the same as when I used improved cylinder with the lead shot ?? Or should I just leave the improved cylinder choke in the gun ??