The Castle Hill Series Batch Two, the second release of the limited-edition batch of 13-year-old hand-selected straight bourbon whiskies bottled at barrel proof. It celebrates the art of batching well-aged casks, one of the many methods Milam & Greene enlists to create its award-winning range of whiskies. The series is named for the historic Texas Military Institute, also known as “The Castle,” in Austin, Texas that is home to Heather Greene’s blending lab.