So, I will try and give all the details up front, including grain bill and mash info, but the general story is that I ended up with a much higher OG than calculated via the recipe and via Beersmith.
Both the recipe and Beersmith anticipated a pre-boil gravity of 1.055, which is exactly what I hit.
Post boil was estimated at 1.068 (including Lactose). I measured 1.080.
I am not worried about the beer, but I do want to learn about what may have caused me to miss the gravity estimates. I have been brewing All Grain for only a few months and have yet to have the experience of overshooting my gravity.
Below is the grain bill/etc, as well as answers to some of the questions I would expect.
Much thanks in advance!
5 gallon batch - Sweet Stout
Pre boil vol - 6 gallons
Mash - 3.75 gallons of water, 11.5 pounds of grain at 152f for 60 minutes. Mashed out for 10 minutes. Fly sparged 3.5 gallons.
8.5 lb Maris Otter
1 lb Crystal 80L 6 row
1 lb Chocolate malt
.5 lb Black Malt
.5 lb Roasted Barley
Pre Boil gravity estimate 1.055 - gravity measured 1.055 (temp corrected)
1 lb Lactose (added at begining of boil)
.5 oz Cluster (60 min)
.5 oz Styrian Goldings (60Min)
OG estimated 1.068 - OG measured = 1.080
Yes, the gravity reading was temp corrected to 70 degree calibration
Yes, I have calibrated my hydrometer
Yes, I tripled checked my gravity reading
Yes, I recognize that the lactose is not fermentable