Yep, in the right situation this can be a deadly tactic. It works well for birds on the roost, too. If you can get away with it, staying a couple of hundred yards or more away from a roosted bird until right at flydown time, and then calling and moving towards the bird like an approaching hen that has just come off the roost will often make a gobbler come to investigate when he might not otherwise. It is a difficult tactic to pull off, especially in open country, but when you can, it really fools them.