Remember, you are not hunting to make a bird gobble, you are hunting to bring one in range so you can kill it...
Some birds simply don't gobble much and they gobble to attract the hens so the hens come to them...
If a gobbler has hens in sight, he doesn't need to gobble...
A bird stops when he gobbles and he can also attract another hunter...Stopping slows him down and gives a hen time to come to him and cut him off...Another hunter can slip between you and him and kill him before he gets to you...
Once a bird has heard you and is headed your way, quit calling...He knows where you are, let him come in...