Phil, it was supposed to be a 5 gallon whisky barrel , used once (Balcones in TX I believe), but it looks more like a 6 gallon barrel.
The batch was 5 gallons, there was a little room left in the barrel, to be honest, I left I left the batch in the barrel for much longer than I intended to, approx 2 months.
The beer itself is supposed to be a cross between Irish and English ales, in my opinion, English ale is a bit light for the bourbon or whiskey, and an IPA would be too hoppy for my taste, so I made an amber ale, light on the hops (Maris Otter base, I added Carapils for a little extra body and mouth feel, a big beer needs it in my opinion).
At first the oak and bourbon (blue corn whiskey) was over powering, but due to lack of time to tend to this beer, I left it for an additional 2 weeks in the barrel and it has seemed to have hit it's "sweet spot", the oak mellowed and is more part of the beer, incorporated, almost the same as a barrel aged wine compared to a wine that was oaked with chips or cubes, this went from an "added oak" taste, where you can taste the beer, then the whisky then the oak, to it all tasting "married", that is the best that I can explain it, the whisky was still a little strong, I didn't mind it, but I felt that I needed to mellow it out a little, so instead of priming with 3 oz of priming sugar, I cut that in half and added a half cup of honey to smooth out the whiskey.
After bottling 2 cases I had about 48 oz left over....I'm sure that I could have put it in bottles...but what fun is that...lol...I let my Daughters boy friend taste a glass, he loved it, and even beer haters like my daughter and wife liked it!
I took my favorite 32 oz glass out and enjoyed every moment of it....until I started seeing double....LMAO!