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Dilution Math, Step by Step: Bringing a Cask-Strength Bottle Down to Your Proof

You bought a cask-strength bottle at 60% ABV, and you'd rather drink it at 45%. How much water do you add? There's a one-line formula for that, and it's almost right. Here's the formula, where it comes up short, and how to get closer, using a 750 mL bottle as the example. (This is about diluting a spirit you bought. It doesn't cover making spirits.) Step 1: the simple formula The alcohol in the bottle doesn't change when you add water; it gets spread through more liquid. So: Starting strength × starting volume = target strength × final volume For our bottle: 60% × 750 mL = 45% × final volume, so the final volume is 1,000 mL . That part is exact, as long as everything is measured at the same temperature (US proof is defined at 60°F, more on that below). The common shortcut then says: water to add = final volume − starting volume = 250 mL . That's the step that comes up a little short. Step 2: why it's short Alcohol and water shrink when you mix t...

The Supreme Court Will Hear a Challenge to the Federal Home-Distilling Ban. Here's Where Things Stand.

Updated November 3, 2026. This is a fast-moving case; we'll update this post as the Court acts. In September we wrote about the Fifth Circuit ruling that held the federal ban on distilling at home unconstitutional , and about a bill in Congress that would change it . Since then, the case has moved to the top of the system. On October 19, 2026, the Supreme Court agreed to hear the government's appeal in Department of Justice v. McNutt , No. 26-204. Here's what that means, and what it doesn't. What the Court will decide The Court took the question the government asked: whether the ban on distilling spirits "in any dwelling house" or "in any shed, yard, or inclosure connected with any dwelling house" is "necessary and proper for carrying into execution Congress's enumerated power to lay and collect taxes". In plain terms: Congress can tax liquor. Can it also ban distilling at home as a way of making sure that tax gets collected? No ...

Proof vs ABV: How to Read the Strength on a Spirits Label

Pick up a bottle of American whiskey and you'll often see two numbers: something like "45% alc./vol. (90 proof)." One is required. The other is optional, and it means something different depending on which country's history you ask. Here's what each number means, what the label rules say, and the conversions worth knowing. The short answer: in the US, proof is twice the ABV US law defines proof as the alcohol content at 60°F, "stated as twice the percent of ethyl alcohol by volume". So: % alcohol by volume US proof 40% 80 45% 90 50% 100 75.5% 151 95% 190 For US proof, that's the whole conversion: multiply ABV by two to get proof, or halve the proof to get ABV. What a US label has to say Alcohol by volume is mandatory. Federal rules require the alcohol content of distilled spirits to be stated as a percentage by volume. Proof is optional. A label can show it, as long as it's in the same field of vision as the ABV statement. TTB...

The Freedom to Home Distill Act: What H.R. 10157 Would Change (and What It Wouldn't)

Update, November 3, 2026: We've updated this post. The Supreme Court has agreed to hear the McNutt case, the bill's cosponsor count is corrected to four, the description of what the McNutt ruling covers is corrected, and the equipment section now describes the bill's product standard without practical advice. Earlier this month we covered the Fifth Circuit ruling that found the federal home-distilling ban unconstitutional. The courts aren't the only branch moving now. On August 27, Rep. Diana Harshbarger of Tennessee introduced H.R. 10157, the Freedom to Home Distill Act . It would put home distillers in the same category home brewers and winemakers have been in since 1978. It's a bill, not a law. Here's what it says, what the numbers mean in real bottles, and what it leaves alone. Why it exists In 1978, Congress changed the tax code to let adults make beer and wine at home, tax-free, for personal use: up to 200 gallons a year per household. Distilled ...

Whiskey Barrel Weekend in Coeur d'Alene: What a Master Class Taught Us About Tasting

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Some whiskey events are a room full of tables and plastic cups. The Coeur d'Alene Resort's Whiskey Barrel Weekend , presented with Maker's Mark, is not that. We spent September 18 and 19 on the lake in North Idaho, and it was one of the best-run spirits weekends we've been to. Here's what it was like, and the one thing from the master class that changed how we taste. Friday: Fuego & Oak The weekend opened with Fuego & Oak at the Hagadone Event Center: tomahawk steaks hung over an open flame grill on the terrace with Lake Coeur d'Alene behind them, tacos, small bites and appetizers going around, and a 120-proof pour to match. It's the kind of evening that sets a high bar for the rest of a weekend, and the rest of the weekend cleared it. Saturday: the Whiskey Master Class The master class was the highlight. An hour, a four-glass flight served blind , a board of smoked provolone, gouda, and cheddar with whiskey cheese straws, an...

How a Solera Works (and Why Westward Says Milestone No. 4 Can't Be Repeated)

Portland's Westward Whiskey has opened pre-sale for Milestone Edition No. 4, its annual single malt release. One line in the announcement stopped us: the whiskey is "drawn from our Solera that can't be repeated." That's not marketing fluff. It's a real description of how a solera works, and the math behind it is one of the more interesting ideas in blending. Here's what's going on. What a solera is A solera is a blending system where the vessel is never emptied. Instead of filling a barrel, aging it, and bottling all of it, a producer draws off part of the aged spirit, then tops the vessel back up with younger spirit. Next time, they draw part again, and top up again. Forever. The technique comes from sherry, where it's run as tiers of barrels: wine is drawn from the oldest tier, which is refilled from the next-oldest, which is refilled from the one above it, with new wine going in at the top. Many whiskey and rum producers run simpler v...

How Much Water Does a Cask-Strength Rye Need? The Math Behind Proofing Your Pour

This week's Breaking Bourbon Whiskey Wednesday newsletter called Old Overholt Cask Strength Rye "a rock of a rye" for Jim Beam, and pointed out something worth knowing: it often sits on shelves for months while people chase harder-to-find bottles. We haven't tasted this year's release ourselves, so we'll leave the tasting notes to them. What caught our attention is two words on the label: cask strength . Because a cask-strength bottle hands you a job most whiskey does for you before it ever leaves the distillery. What "cask strength" means Most whiskey is proofed down before bottling: water goes in until the spirit hits its target strength, often 40% to 50% ABV (80 to 100 proof). Cask strength skips that step. The whiskey goes into the bottle at or near the strength it came out of the barrel, which frequently lands somewhere around 55% to 65% ABV. That's why cask-strength releases carry a different proof every year. The strength...