This very special beer was brewed as a Double Strength Imperial Stout. Imperial Stouts being very big beers to begin with, that puts this at the strength of a barleywine. The Original Gravity is 27.5 P/1118, then the hopping level is very hard to define, though there are enough hops to achieve 100 IBUs in a smaller beer, this beer still has a distinct sweetness due to a high percentage of unfermentable sugars. After fermentation, this beer was aged in old whiskey barrels from the McCormack’s bottling plant in Weston, MO, hence the name Owd Mac’s (owd being a British regional colloquialism for old).