Everyone to their own experiences, early to mid march starts the return flight depending on southern warm wind flow. For the Northwest area of NJ the best time to gun crows is between Oct 15th and November 15th. This is the peak of the the flight, moon phase and cold fronts will dictate the size of the flocks.( one day you can do 80 or so birds the next well over 150) If you study the area, the normal roasts will start to grow numbers at this time and many staging areas will grow during afternoons on any day. This is when you want to use feeding sets during the mornings and fighting sets during afternoons. -side note, if you need shot bigger then 7 1/2 or 8 you are not getting the birds in tight. Improve your blind with brush, wear a ghilly suit ( you may need to shoot some clays wearing the head net, some folks have a issue with stuff on their face when shooting)