Art of the Spirits Final Run Madeira Cask Finish is a cask strength American whiskey bottled by Art of the Spirits in Colorado. The reviewed single barrel used a mash bill of 75% corn, 21% rye and 4% malted barley, aged 6 years and finished for 11 months in Madeira casks. It was bottled at 108 proof (54% ABV) and sells for around $100.