I bottle condition. In adding only a few ounces of booze to 5 gallons. Maybe raises the ABV by .1 % (I've done the math, but don't remember).
I did add half pack of dry champagne yeast at bottling as insurance.
Good to know! I am lazy and didn't feel like doing even the quickest of math on it, but that makes sense for adding to a large batch. I'll have to try this soon. College football season is on the horizon and nothing says gameday like a little bourbon