Fall birds often have a pattern they follow, more or less. They will roost in one general area and move to food sources about the same until they change because of weather dictated food availability. Find the birds and learn where they're going to feed and then worry about calling.
I think one of the best rules for fall calling is slow it up and draw it out. You don't hear as much excited calling in the fall. Most of the communication is related to locating each other among the flock. Yelp strings should be a bit slower and strung out to a run of 7-8 long yelps. Short hard clucks will get an answer, but won't necessarily bring birds running. Gobbles and hard purrs will work some too as Gobbler flocks are constantly testing who's dominate. Probably the call everyone should know for fall hunting is the whistle or Kee Kee run. All age groups will answer it and come to it. Young birds rarely resist calling back to a whistle. I also use what I call the chirp. It is a soft musical short yelp that flocks to as they move along. You will often get answers to it when nothing else works. I focus on Gobblers in the fall and my calls are almost exclusive gobbler yelping and hard clucks with an occasional gobble.
Number one is find where the birds are heading and get in their way, as they will rarely deviate very far off course to come to you, unless you find a lone bird that is looking for a flock to join. I do not hunt to bust flocks because it is very rare I get good enough position to get a sufficient bust. At 62 and with both breathing and a tad of heart disease it is an act of futility for me to hunt to bust flocks. If you do get a bust go after the one loan bird that went completely opposite of the group.
