What is the maximum entry proof for bourbon before it is placed in barrels for aging?

The maximum entry proof for bourbon before it is placed in barrels for aging is indeed 125 proof, which is equivalent to 62.5% alcohol by volume. This regulation is defined to maintain the integrity and flavor profile of the bourbon during the aging process.

When bourbon is distilled, it must be entered into barrels at a proof that adheres to these guidelines to ensure that the aging process occurs correctly, allowing the spirit to interact with the wood of the barrel without excessive evaporation of alcohol, which can occur at higher proofs. Allowing a maximum of 125 proof helps balance the extraction of flavors from the charred oak while controlling the interaction between the spirit and the wood, leading to the desired characteristics of the final product.

This legal standard is significant in maintaining the tradition and quality of bourbon production, distinguishing it from other spirits that might have different regulations regarding proof and aging.