Tasting: 2 Rye Whiskeys from Rossville Union (MGP) By Jim Vorel | February 16, 2021 | 1:38pm Photos via Rossville Union Once upon a time, Midwest Grain Products of Indiana was simply known as the source of so many non-distiller-producer whiskey brands cluttering up the shelf at the average package store. MGP, as it’s much more commonly known, is a former Seagram plant with a legendarily large production capacity and warehouses, containing stock of aging whiskey that goes back to time immemorial, in a huge array of mash bills and aging techniques. This makes MGP something of a Willy Wonka-style wonderland for a young distillery sourcing bourbon or rye whiskey, as there is no shortage of variety for the choosing.