Winners Crowned at 2015 NWTF Grand National Calling Championship

The 39th annual National Wild Turkey Federation Convention & Sport Show is officially underway in Nashville, Tenn., at the Gaylord Opryland Resort and Convention Center.

And with the annual turkey hunter's gathering opening up in the Music City, the air is already filled with loud and raucous yelps, cuts, cackles, gobbles and owl hoots by competitors on the stage and those warming up in the outside waiting areas.

That cacophony of turkey noise is because the NWTF's 2015 Grand National Calling Championships are now officially underway. And by midday on Friday, some three turkey calling titles had already been decided in northern Tennessee.

In the GNCC Team Challenge...