Here are the results from my second all-grain brew session using the Dirty Cow recipe.
I hit around 80% efficiency. That'd be great normally since it means that I converted more of the starches to sugar meaning more alcohol. However, since I was calculating at 70%, it drove my potential ABV way above the guidelines. I'll probably still enter it in competitions, since most people wouldn't know the difference of a 5.5% beer vs. a 6.4% by taste.
I used a Kolsch yeast slurry provided by Willie (www.yearofbeer.com). It's bubbling away right now.
Next up. Ein nettes Bier des deutschen Weizens.