Rolling Standard Midwestern Four-Grain Whiskey is a very interesting approach to creating a four-grain. Instead of using all four grains together in the same mash, Union Horse Distilling distilled a wheated Bourbon and distilled an American Single Malt, aged both for five years, and then blended them together. After the blending process, the whiskey is then returned to those barrels another 18 months together before being blended again as a small batch. It is non-chill filtered and bottled at 92°.
You can read this review in its entirety over at Bourbon & Banter. Cheers!