Bushmills whiskey available then, with this exceptional cask being 227.Bushmills Millennium Malt is a series of single cask bottlings from whiskey distilled in 1975 and matured in ex-Bourbon barrels. This unique Bushmills Millennium Malt has come straight from the cask, pure and unfiltered, following the ancient tradition that is whiskey making in Ireland. The addition of water, which flows over the basalt rock from St. Columbs Rill, to bring it to its bottled strength, is the only change Bushmills have made to your whiskey since it began the slow gentle process of maturation in your cask, back in 1975.