To make their mark in bourbon, Louisville-based Copper & Kings—best known for bold American brandies—released their first-ever bourbon finished in their own apple brandy barrels.

For years, Barrell Craft Spirits has built its reputation on blending — sourcing and marrying whiskeys from across states, ages, and mashbills to create something greater than the sum of its parts. But with the new Cask Finish Series, they’re taking that expertise into a different arena: secondary maturation.