Does bottled-in-bond mean the same thing as barrel proof?
Short answer: No; they're two different, unrelated claims that happen to both show up on premium labels.
Bottled-in-bond (27 CFR § 5.88) is a set of production and paperwork rules dating to the Bottled-in-Bond Act of 1897: the whiskey has to come from one distiller, at one distillery, in one distilling season, aged at least 4 years in a federally bonded warehouse, and bottled at exactly 100 proof; no more, no less.
Barrel proof (also called cask strength) means something completely different: the whiskey was bottled straight from the barrel with no water added to bring the proof down, whatever that number happens to be; commonly well above 100, sometimes over 130.
A bottle can be one, both, or neither. Bottled-in-bond whiskey is always exactly 100 proof by definition, while barrel proof whiskey is whatever proof the barrel happened to age to. The two labels aren't making the same claim about strength.
Practical Takeaway
If proof is what you care about, read the actual number on the label; "bottled-in-bond" tells you it's exactly 100; "barrel proof" tells you it could be almost anything.
Sources
Last reviewed September 14, 2026