Absolutely true The rabbit call works great, but I don't use it. After you call, the crows almost show up instantly so if you've got #4 or #6's in your shotgun, are you gonna change out to #4 buck and wait for a coyote. You only have about a minute to make up your mind. Crows gathering over head is a good thing when your calling preditors. I've wrestled with this one for a while. Once you call in crows with a rabbit call and shots fired, your busted, there done and any coyote that is on it's way is gone to. you may drop 1 or 2 but it's over And you've educated every critter within ear shot. It works but I don't use it.
I think that everyone will testify that leeding crows is an art in it self. expecially when there excites and trying to locate the sound. There flying 50 ft per second and they turn up or put the brakes on. You have to read them, and that takes some time to get. I get rusty if I have'nt gone for a while. I'm sure you'll get it.
Oh ya, one other thing. When i use my e-caller I set up and wait till I hear a crow before I turn the caller on. I run it for about 15 seconds and then turn it off. usually they'll show up imediatly, If you hold off a little they'll land in the tree tops, hopfully were your setup and watching, BLAST-AWAY and then turn the caller back on 5- 10 seconds and then off again. They'll come back around again and again. I use a hand call with the e-caller sparingly maybe 2 cawls and then 3 cawls. I never try to talk to them. I don't know why it works so good but it really brings'm in and they are excited.
Good luck and don't get busted!