Marksman, for the past month I've been on Google maps searching (within a 50mile radius) around my home for feed mills, ranches, stables, Ag farms, golf courses, open lots/field. Must have called over 20-30+ places. Finally got a possible permission at a feed mill 20min from my house, also connected with an old coworker who has some property that would allow me to hunt on. If non of those places worked out, I was about to go door knocking (which I still might do).
Keep searching you'll only need to find one or two, then build your network of permissions from there. Someone also told me to ask the farmer or property owner if they have pest/rat problems that'll get your foot in the door (those folks love free work) from there you can gradually move on to pigeon, rabbits, doves.
Hope this helps. Good luck!