US★1 Barrel Strength Sour Mash starts as the same Original Sour Mash whiskey Michter's bottles at 86 proof. It is distilled and bottled in Kentucky, with Master Distiller Dan McKee setting the specification, and made by the sour mash method, in which part of one fermentation is carried into the next. The spirit goes into toasted and fire-charred new American white oak at 103 proof. Master of Maturation Andrea Wilson and the tasting panel decide when the barrels are ready; they are then batched, left uncut, passed through Michter's signature filtration and bottled, each batch at its own proof.

Every bottle sold through Midnight Whiskey is sourced as an authentic, sealed product and inspected before it ships. Orders are packed with padded, glass-rated handling and require an adult signature (21+) on delivery; we do not ship to anyone unable to verify legal drinking age. For our full sourcing and handling protocols, see our editorial and authentication standards.

What proof is Michter's Barrel Strength Sour Mash?

Michter's US★1 Barrel Strength Sour Mash is bottled uncut at barrel strength, so its alcohol level varies from batch to batch and each label is filled in with its batch's proof. It entered toasted and fire-charred new American white oak at 103 proof, and each batch is bottled without being cut.

Is Michter's Barrel Strength Sour Mash a bourbon or a rye?

Neither. Michter's says the grain selection behind its Original Sour Mash means the whiskey cannot be categorized as a bourbon or a rye, and the Barrel Strength Sour Mash is that same whiskey bottled uncut, labeled Kentucky Sour Mash Whiskey.

How is Michter's Barrel Strength Sour Mash different from US★1 Sour Mash?

Michter's builds US★1 Barrel Strength Sour Mash from the Original Sour Mash whiskey behind its 86-proof US★1 Sour Mash, but leaves each batch uncut, so it is bottled at barrel strength rather than proofed down. It was first offered in May 2026.