We got the state to stock some birds on a 2,200 acre lease several years ago. THey put out a couple of gobblers, a jake or too, and about 12 hens. It took 5 years before we had enough birds to allow a gobbler or two to be taken. Soon after that the population really took off and we were able to take 5+gobblers a year

Once the flock reachs a certain critical mass the population explodes. I am not sure what the number is, but with good hatches in back to back to back years you can go from few birds to an abundance of turkeys.