This Primos Magnum Roar Deer Grunt Call is the most accurate buck grunt and Challenge Wheeze of any deer call we have ever made and when you need that Magnum volume to get a response from a mature buck, reach for the Magnum Roar! This is our loudest most accurate sounding Buck Roar EVER!!! No other call on the market can so accurately reproduce this sound. When proto-typing and testing this call Will Primos was able to call in the largest buck he has ever taken in his home state. Believe us it works!