This review is for the 100 proof BIB (bottled in bond). Old Grand Dad is a reference to Basil Hayden who began distilling a high rye grain bourbon in the late 1700's, and this OGD is allegedly a similar recipe.
Bottled in Bond is (from Wikipedia, as I would have nothing to add)
Bottled in bond refers to American-made spirit that has been aged and bottled according to a set of legal regulations contained in the United States government's Standards of Identity for Distilled Spirits (27 C.F.R. 5.21, et. seq.), as originally laid out in the Bottled-in-Bond Act of 1897,
To be labeled as "Bottled-in-Bond" or "Bonded," the spirit must be the product of one distillation season and one distiller at one distillery. It must have been stored (i.e., aged) in a federally bonded warehouseunder U.S. government supervision for at least four years and bottled at 100 (U.S.) proof (50% alcohol by volume). The bottled product's label must identify the distillery (by DSP number) where it was distilled and, if different, where it was bottled.
Nose - Brown sugar, corn, toffee.
Flavor - If I were asked "what does bourbon TASTE like" or "give me a pour of something that tastes like bourbon in it's most raw form", I would pour this. The taste is very bold, very spicy and somewhat woody. Fantastic balance between the sweetness of the corn and the peppery quality of the rye.
Score - 88 - Highly recommended, especially considering the $20 price. If you are new to American whiskey, try this next.