Chattanooga Whiskey 91 is made from a four-grain mash bill which in addition to yellow corn uses three malted grains: rye malt, caramel malted barley, and honey malted barley. The mash bill recipe was chosen by master distiller Grant McCracken -- Barrel 91-- from the 100 barrels distilled at the brand's experimental distillery. Chattanooga refers to this whiskey as a Tennessee High Malt, but technically this is a straight bourbon. Matured for a minimum of two years in toasted and charred barrels and is finished in a charred 4000-gallon oak solera barrel.