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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.
III. How Bourbon is Made. 1. Grains-The main ingredient in bourbon is corn which varies from 51% to 79% depending on the brand. The other ingredients are rye, malted barley (10-15% each), and in some cases red winter wheat (10%).