I just did my first 10 gallon batch last night It's a milk stout clone recipe.
I had problems with my barley crusher, so finally I got it, sorta, working. But I had done a graff the other day where my efficiency was ~ 47% because the gap was too big.
For this milk stout, I got the barley crushed working at a larger than desired gap, so I ran it through twice. It was pretty well crushed by then.
I added the grain to the mash and had a ton of dough balls. I also got my first stuck sparge, but it was easily fixed. I mashed for 75 minutes and I did a fly sparge @ 170f
As I collected the runnings, I let it drain super super slow.
I ran my numbers using homebrewing.com and it says:
Brewhouse Efficiency Calculator
Points/Pound/Gallon (PPG): 32.34
Pre-Boil Gravity: 1.064
Total Fermentable Amt: 22.76 lb
Pre-Boil Wort Amt: 11.5 gal
Fermentable 1: 14lb Two Row
Fermentable 2: 2lb Crystal 60
Fermentable 3: 1.50lb Munich
Fermentable 4: 1.50lb Roasted Barley
Fermentable 5: 1.50lb Chocolate
Fermentable 6: 1.25lb Flaked barley
Fermentable 7: 1.00lb Flaked oats
Is it really possible to get that High of an efficiency, or is something wrong?
If it's important, I have a 10 gallon mash tun with false bottom my mash temp was at 151f