I've only used a grunt call one time (an adjustable) so I really can't recommend their usefulness other than I did shoot a 5 pointer that day.... so maybe it works, maybe not. This is a bit embarrassing but I pretty much mimicked what I heard when playing games like Hunting Unlimited 2-3 and some of the other hunting games..... (but of course I didn't just sit there and honk away.... I made a 2 or 3 grunts or bleats about once every 5 to 10 minutes)