We once visited the Speyside Cooperage and during the tour they mentioned that the best casks lose 2-5% of the liquid per year according to where in Scotland the distillery is located.
Yes, exactly.
By Scottish law, today's largest casks are 700 liters. If you only use the 2% rule as the "Angels share," as the Scots call the evaporation, after 200 years you'd have about 10 liters.
200 years ago they moved the casks on the sides of mules. Can't imagine a mule hauling two 700 liter casks.
I love single malt Scotch. Before I quit keeping track I had logged more than 600 different ones in my log book. Yes, I was a bit OCD about it -- tasting notes and the whole bit.
The oldest one I ever had the pleasure of sampling came from a single cask that had been distilled and put in the cask in February 1952. The bottler emptied the cask in February 2012 to celebrate Her Majesty the Queen's Diamond Jubilee. The American White Oak cask (about 250 liters) netted only 88 bottles after 60 years. A bottle ran $28,000 here in the U.S. Yes, the whisky was delicious. One of my all-time top six.
I was a purveyor of fine single malt scotch for more than a decade, with a rotating selection of 86 different single malts on the back bar -- most folks had never heard of any of them. I hosted monthly tastings at my inn, and many outside the inn.
One thing I could never abide at my tastings was a loud, obnoxious, self-appointed scotch snob who put down others for not liking "his" (yes, the snobs were always men!) favorite.
I thoroughly enjoyed those who just wanted the experience of tasting five half-ounce pours (not shots) through the course of a three hour session. Great fun.
I've toned down my sampling, and I stopped keeping track of new ones, but I still have a commendable selection of malts in my private stash. I enjoy a wee dram occasionally, when the mood strikes, like right now -- enjoying a wee dram of Auchentoshan American Oak from the Lowlands. Simple, yet, oh, so good.
Slàinte mhòr (Scots Gaelic for "to your very good health")