The Stagg Jr. The Soro Family Single Barrel Select Proof is a limited edition bourbon from Buffalo Trace Distillery. It is bottled at 138.6 proof and is aged for 8-10 years in new, charred oak barrels. This bourbon has a deep, rich flavor with notes of caramel, vanilla, oak, and spice. It is a great sipping bourbon and can also be used in cocktails.