Nice. We just did this back in January with a Stranahan's whiskey barrel. Racked ~45 gallons into the 53 gallon barrel and aged it for 3 months. Turned out stellar. Silky smooth, with lots of great vanilla, caramel, and of course whiskey flavors from the barrel. Have 5 gallons on CO2 and 5 gallons on beer gas. Tastes like heaven from the nitro tap.