Tennessee Distilling Company – Heaven’s Door Revelation Double Oak Bourbon Columbia, Tennessee, USA Revelation - Double Barrel Whiskey - 100 Proof Revelation Double Barrel Whiskey is comprised of a unique blend of two different straight bourbons and one straight rye. Each one is aged independently in new oak barrels for a minimum of five years before being blended and aged an additional 6-12 months in custom Radoux barrels. The finished product came out so smooth, we increased the bottling proof to 100.