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Bourbon - Grain Selection and Mixture (Mash Bill)

Each distillery has its own recipe for the grain mixture. The law requires a Kentucky straight bourbon whiskey to have a corn content of at least 51%. However, the corn content is usually higher (between 60% and 80%).

Further components of the mash bill are rye and malted barley, which each make up between 10% and 15%. Few distilleries add wheat to their mash bill (e.g. Bernheim or Maker's Mark). Wheat makes a whiskey milder and smoother on the tongue. If wheat is added, it makes up about 10%.

The Grain mills of Four Roses — Four Roses - Grain mills

The different grain types are ground separately and stored temporarily. In former times hammer mills were used until it was found out that they heat up the grain too much, which affects the taste. Today the grain is usually crushed in order to open the husk. The following grinding process leads to very fine flour.

Mashbills of different distilleries

Distillery	Corn	Rye	Malted Barley	Wheat	Special
George Dickel	84	8	8
Jack Daniels	80	8	12		Estimate
Heaven Hill	75	13	12		Different Brands have different Mashbills
Barton	75	15	10
Willet	72	13	15
Jim Beam	77	13	10		Different Brands have different Mashbills
Makers Mark	70		14	16
Four Roses	75	20	5		Different Brands have different Mashbills
Wild Turkey	75	13	12
Buffalo Trace	90	10			Different Brands have different Mashbills
Woodford Reserve	72	18	10
Michters	-	-	-	-	Secret
Koval	-	-	-	-	Secret/Single Grain Whiskey