Woodford Reserve Master's Collection Four Grain Batch #2 Kentucky Straight Bourbon WhiskyPart of the Woodford Reserve Master's Collection, this is the second batch of Four Grain bourbon that was released across the US in 2006. The previous year, the first batch of this same expression was only limited to distribution within Kentucky. Just like the previous batch, it was distilled with a mashbill of corn, malted barley, rye, and wheat. It is now a collector's item.