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The typical grain mixture for bourbon, known as the mash bill, is a minimum of 51% corn, with the remainder being rye, wheat, malted barley, or some combination of these. A mash bill that contains wheat instead of rye produces what is known as a wheated bourbon. The grain is ground and mixed with water.
ALSO: The Great Whiskey Heist. Bourbon needs to be produced in America and made from 51 percent corn, and whisky does not, says Maker's Mark Master Distiller Greg Davis. Bourbon also needs to be stored in new charred-oak barrels, whereas whiskey barrels do need to be oak but not new or charred.