Power-Calls Big Bore Specklebelly Goose call is designed to have the full range and volume of a Specklebelly Goose while maintaining user-friendly operation with its built-in back pressure. Our Pan Style Gut incorporates a shallow, but super wide tone channel so you can insure that every ounce of effort you put into this call will be transferred into sound. What you get as a result are loud ear-piercing yodels, soft clucks and murmurs with ease.