Willett Family Estate Rare Release Barrel No. 5272 delivers nine-year Kentucky straight bourbon uncut, at the full 138.8 proof the whiskey carried out of its cask in the distillery’s Bardstown rickhouses. Single barrel means exactly what it says: every bottle on this listing came from one cask, and when barrel 5272 runs dry there is no second batch. Nine Kentucky summers at this strength build a dense, dark whiskey, and a few drops of water open it up considerably. Willett bottles these Family Estate picks in small numbers for drinkers who want the proof on the label to be the proof in the barrel. Pour slowly, and keep the water pitcher close.