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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.
Distillers make bourbon and other whiskeys from grains, but the primary grain in the mash thatâs used for different types of whiskeys varies. A true bourbon comes from mash made with at least 51 percent corn, while a rye whiskey requires a mash made up of at least 51 percent rye.