Jack Daniel's Single Barrel 2020 Special Release Barrel Proof RyeJack Daniel's Single Barrel 2020 Special Release Barrel Proof Rye This annual special release Single Barrel Barrel Proof Rye celebrates the early craftsmanship of the Jack Daniel Distillery, honoring a time when American whiskey was often high in rye content and offered at barrel strength. Bottled in its purest form right from the barrel and uncut at full proof, its packed with Jack character with our signature smooth finish. 750ML glass bottle 66.