"One of those Bourbons where a single glass is never quite enough. Great stuff!" Jim Murray. 95 points. Johnny Drum Private Stock Kentucky Straight Bourbon Whiskey is the premium offering from the Johnny Drum range. Bottled at 101 proof, this big bold bourbon is a terrific rich, mellow old-school sour mash bourbon produced in very limited quantities to a method unchanged in five generations of quality distilling. At cask strength , this is the flagship from the Johnny Drum range of handmade bourbons, produced in small batches at Willett Distillery.