W.L. Weller Full Proof is a 6-8 year, bottled at barrel entry proof (114) expression of Buffalo Trace's famous wheat mash, sharing the same mash and proof as the famous Pappy Van Winkle. Weller Full Proof initially released in 2019 by Buffalo Trace. While the initial release of the Weller Brand was actually in the 1840s, Buffalo Trace did not acquire and release it until 1999. At that time, the Weller Special Reserve was the only W.L. Weller released. Today the brand has expanded even further to include several releases in the W.L. Weller Brand. The Weller Full Proof is one of the last bottles to join the yearly release.

The bourbon is meant to be a soft, moderately-aged bourbon with an added level of complexity to a wheat bourbon that is otherwise soft and sweet. Though there is a new release each year, due to the barrel entry proof, there isn't much variation between releases. The fact that this is a wheat bourbon and the proof is on the lower end of "high proof", this bourbon drinks softer than many other high proof entries. But make no mistake, it still has some heat. Each expression captures the sweet notes of a lower proof wheat mash with much more complexity, while still maintaining a level of smoothness and refinement.