Updated March 2026.
MGP bourbon is not a TTB class. MGP Ingredients (the Ross & Squibb / Lawrenceburg, Indiana plant) is a contract distiller. Bottles that disclose that DSP are still bourbon only if they meet Mash-bill percentages are unpublished on most official pages — not invented here. A 1.5-ounce pour is one NIAAA drink at 40% and 1.25 at 50%. Read the neck, not the forum shorthand.
Related: who makes Yellowstone, craft bourbon, what is bourbon.
Source vs class
| Word | Keep |
|---|---|
| MGP / Ross & Squibb | Indiana contract DSP — not a legal type |
| Bourbon | Still 27 CFR 5.143 |
| Mash-bill % | Unpublished unless the label prints it |
| Yellowstone 2026 LE | Sourced 7- and 14-year blend |
Luxco’s Yellowstone line names Limestone Branch as home; the 2026 Limited Edition press release did not call those barrels Limestone distillate. That is one sourced example, not a map of every MGP client. Pour math: whiskey drinks.
Sources
- TTB 27 CFR 5.143. MGP is a company/DSP, not a standard of identity.
- Yellowstone 15 Jul 2026 Luxco PR: 101-proof LE described as sourced 7- and 14-year Kentucky bourbon.
- NIAAA December 2025. No mash %.