Inside the bottle

Why your proof drifts and what it tells you

2 minute read · The Blending School

Plot your bottle's proof over a year and you get a jagged line drifting up or down. That line is not noise. It is a chart of your taste, drawn one pour at a time.

The mechanics of drift

Every addition pulls the blend toward its own proof, weighted by volume; every glass out changes nothing. So the proof line moves only on additions, stepping toward whatever you poured. Feed the bottle barrel-proof pours and the line climbs. Feed it 86 proof daily drinkers and it sinks. The bottle has no opinion; it averages yours.

Reading the line

• A steady climb means your buying habits lean hotter than your bottle. Common for keepers who reserve the infinity bottle for special, usually cask-strength, pours.
• A slow sag means the everyday pours dominate. Nothing wrong with it, unless the blend is losing the intensity you liked, in which case one barrel-proof addition is worth several ordinary ones.
• A sudden step marks a big event: a heavy pour, a split, a deliberate dilution. Steps are the bottle's chapter breaks.

Steering on purpose

Once you can see drift, you can steer it. Decide on a home band, say 105 to 112, and use two tools: headroom math to know how much of a hot pour fits under the ceiling, and measured water to trim back down when you overshoot. Between them, proof stops being something that happens to the bottle and becomes something the bottle does on request.

Proof is a proxy, not a grade

Higher is not better; it is louder. The interesting discovery, once you keep both proof records and tasting notes, is where your bottle shows best. Many keepers find a specific band where their blend opens up, and it is rarely the maximum. Finding that number for your own bottle is one of the genuine payoffs of writing everything down.