Last night I transferred my Harvest Wee Heavy (Pumpkin Scotch Ale) to secondary for some simulated bourbon barrel aging. A little over two weeks ago, I charred some American oak staves in my oven and cut them down to 3" lengths (so that they would fit in a mason jar), and put them into a jar with some Buffalo Trace bourbon. Now that they've had plenty of time to soak up the flavor of the bourbon, I added the jar - whisky and all - to the secondary at racking.
Final gravity was 1.018, a few points under my estimated FG of 1.024, giving an approximate ABV of ~8.4%. It's a bit dryer than I had expected, but the hydrometer sample still tasted pretty close to last year's batch. I will need to add more spices at bottling, however, probably using a tincture with vodka.