Whisky USA
According to US Trade Legislation, a “bourbon” is a type of whiskey where the “mashbill”—which is the recipe of grains used to produce the whiskey—consists of 51% - 80% corn.
Typically, distillers use approximately 70% corn content and are free to choose other grains for the remainder of the mashbill. The type of grain used will affect the style and flavors of the whiskey.