When I tried this, I had never done it before and had no idea what to expect, but it makes sounds which could, I think, call in a really, really lonely turkey. To run it, hold the shotgun shell in the web between your thumb and index finger. You can cup the other hand over that one to make a sound chamber and change tones. Put about a quarter of an inch of the mouthpiece between your lips and, keeping your lips pressed together, make a kind of kiss, sucking into the call. With a little practice, you can get decent clucks and yelps out of it.