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3 Best Barrel Proof Whiskies Whiskey is known as a delicious spirit that packs a punch, but few know about cask strength, otherwise known as barrel proof, whiskey. Cask strength refers to the heightened level of alcohol-by-volume (abv) of whiskey while it is stored in a cask for maturation. This number usually ranges from 60 to 65 percent abv. Cask strength is different from what you’re used to buying because most bottled whiskey is diluted with water to lower its abv. Watering down b …