I also own a bourbon barrel from Tuthilltown, and just filled it for the first time last week.
3gal of quad in the barrel and 1 gal in a growler
I have never used a barrel before, and was surprised by the rate of absorption/evaporation.
How long do you think your beer will be in the barrel for? I dont have an idea of how long my beer will be in the barrel for, I just plan on tasting it and bottling when I feel it is ready.