Entry Proof
Entry proof (or barrel-entry proof) is the proof at which new-make spirit is filled into the barrel for aging. In the U.S., bourbon must enter the barrel at no more than 125 proof.
In short: Entry proof (or barrel-entry proof) is the proof at which new-make spirit is filled into the barrel for aging. In the U.S., bourbon must enter the barrel at no more than 125 proof.
Entry proof affects how a spirit extracts flavor from the wood and how it loses volume versus proof over time. Recording entry proof on each fill is the starting point for tracking maturation, loss, and value across the barrel's life.
What is the maximum entry proof for bourbon?
Bourbon must enter the barrel at 125 proof or lower (27 CFR 5.143 by way of the class definitions). Many houses fill below the ceiling on purpose: lower entry proof extracts differently from the oak and stretches more barrels from the same distillation.
Why does entry proof matter economically?
Entry proof sets how many proof gallons go into each cask and how proof drifts during aging. It changes barrel count, warehouse space, water usage, and the character of the whiskey, so it is a recorded, deliberate number, not a habit.
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