The namesake and grandfather of the Weller Bourbon lineup is William Larue Weller, from the Buffalo Trace Antique Collection (BTAC). This is the true Barrel Proof expression of the Weller Brand, bottled Uncut and Unfiltered however it comes out of the barrel. This means the proof changes with each year’s bottling. In 2020, William Larue Weller was bottled at a whopping 134.5 Proof (67.25% ABV).