The only success I' ve encountered using a Gobbler/Jake call is when the Birds have gotton Lock jaw for some unknown reason or a bird is locked up just out of sight. We have used the fighting Purr in addition to several Gobbler calls in about a 15 minute sequence. All your imitating is two Gobblers going at it, BUT, this is the kicker, when all of this ruccuss is going on, you cant hear a thing(other hunters or birds) so be very picky on when and where you do this. All of the birds I' ve taken using this method came in HARD & FAST , some were gobblin the whole way some were just running around in circles looking. We have pulled birds in from so far it wasnt even funny. Be careful anytime you plan imitating a Tom in the woods cause everything from Coyotes to People come looking for you !
Good Luck and Be Safe !