Just to add a quick two cents to this...

Many people tend to give turkeys a bit more credit than they deserve when it comes to intelligence. Turkeys both see and hear well, but they aren't human. They can't add two and two together like we can. If they hear a shot that spooks them off they'll usually run off and if you call again in 45 minutes - an hour later you can generall get them to come back in. I've been out and shot one tom and heard another in the distance and was able to call that one in for my father without ever going out to retrieve my downed bird.