Yeah, the bottle says 12.5% but I do believe its way off. It's pretty difficult to determine the ABV on barrel aged beers, let alone several BA beers blended for the Firestone 14. You've always gotta figure in the bourbon from the barrel, which is tough since its always different.
Az, I expect more from you. Next time post a clever use for the hydrometer.
I AM THE STANLEY CUP CHAMPIONS!
ABV is determined by comparing orginal gravity with final gravity. or on a triple sale hydrometer, there is a built in ABV %
It could be an issue with losing some water to the barrel or gaining some fermenable sugar but that would only increase alcohol % further I am guessing.
Az, you were right.
The barrel adds alcohol (from what was previously in there) plus some sugars the beer extracts from the wood