Well... that's kind of a tricky question. Choke selection certainly makes a difference in range. A full choke extends the range, but makes hitting more difficult at closer decoy ranges. Thus my choice of Modified for an all around choke. If you center them with the pattern 40 yards isn't out of the question for my recommendation above. You can add powder and shot, change to a full choke, and extend the range another 10 yards or so.