Most American whiskeys require new charred barrels, corn whiskey being the most common exception. See pages 21-24: https://www.ttb.gov/images/pdfs/whisky-webin

Most American whiskeys require new charred barrels, corn whiskey being the most common exception. See pages 21-24: https://www.ttb.gov/images/pdfs/whisky-webinar.pdf https://www.ttb.gov/images/pdfs/whisky-webinar.pdf