Smooth Ambler Straight Bourbon Old Scout Custom Barrel 5 Yr 119.2 750 MLSmooth Ambler Straight Bourbon Old Scout Custom Barrel 5 Yr 119. 2 750 ML is a cask strength single barrel release that reflects the true artistry of American bourbon. Bottled at a powerful 119. 2 proof, this limited edition shows off the bold character that comes from careful barrel selection and five years of maturation. Smooth Ambler Straight Bourbon Old Scout Custom Barrel 5 Yr 119. 2 750 ML delivers layers of caramel, vanilla, toasted oak, and