The Costco Kirkland Signature 20 2020 Sherry Cask Finish is a bit of a mystery in terms of its origins. As you mentioned, it does not disclose the specific distillery where it is produced. This is not uncommon for many independent bottlers, such as Alexander Murray, who source their whiskies from different distilleries and release them under their own labels.
In the case of this particular Scotch, we know that it is a Speyside single malt, which narrows it down to the region of Speyside in Scotland. Speyside is home to over 50 distilleries, including well-known names like Glenfiddich, Macallan, and Glenlivet, as well as lesser-known distilleries.
The fact that the whisky has a sherry cask finish adds another layer of complexity. A sherry cask finish means that the whisky was aged in ex-bourbon barrels initially, and then transferred to sherry casks for an additional period of maturation. The length of this finish is not disclosed, so we don't know how long the whisky spent in the sherry casks.
It's important to note that Costco's Kirkland Signature whiskies are known for their quality and value. While they may not disclose the specific distillery, they often work with reputable independent bottlers like Alexander Murray, who have a keen eye for sourcing exceptional whiskies. This means that even though we don't know the exact distillery, we can still expect a high-quality product.
To give you an idea of the quality of Kirkland Signature whiskies, I can share my personal experience with their products. I have tried several Kirkland Signature whiskies in the past, including their Islay Single Malt Scotch and their Canadian Whisky, and I have always been pleasantly surprised by the quality. The whiskies have been well-balanced, flavorful, and enjoyable, often punching above their price point.
While we may not know the exact distillery behind the Costco Kirkland Signature 20 2020 Sherry Cask Finish, we can trust that it has been sourced from a reputable distillery in the Speyside region. The sherry cask finish adds an extra layer of complexity and flavor to the whisky. Based on my personal experience with Kirkland Signature whiskies, I would expect this expression to be of high quality and provide an enjoyable drinking experience.