3.6 for a while. Then left it, half bottle, for two months. Moved to 4.1. I opened a bottle of Batch 47 yesterday and I was pleasantly surprised. While being 60% ABV, with a spoon or two of water, it is very smooth with no burn. Sherry monster indeed with very sweet notes and a rich taste that lingers for a fabulous spicy finish. I can see why many people recommend this as a Christmas dram.