Bomberger’s Declaration Straight Bourbon 2021 Release Bomberger’s Declaration Straight Bourbon 2021 Release is a robust Kentucky Straight Bourbon Whiskey bottled at 108 proof with a broad spectrum of distinctively rich characters. It is matured in special barrels, some of which were made from Chinquapin oak that has been naturally air dried for over 3 years. Bomberger’s Declaration Distillery Bourbon honors the legacy of the former distillery known as Bomberger’s in the 1800’s and later as Michter’s in the 20th Century.