I did some searches but I couldn't find a definitive answer on the rate of mash water absorption for an oatmeal stout. I made this recipe once before and it's real good but I mashed in with a water volume based on the entire gran bill and the beer was a little thin IMHO. I think the mash volume should be reduced to account for the 3lbs of cold steeped grains. I normally mash at a ratio of 1.5qt/lb of grain but wondering if 22% of my grain bill is flaked grain changes absorption enough to take it into account.
The mash grain bill will be: (10 gal finished batch)
14lb 2 row
2lb C-10
4lb flaked oats
.5lb flaked barley
Mash for 90 min @ 154F
I will also cold steep (2qts/lb grain) and add steeped liquid to the last 10 min of the boil
1lb Carafa III
1lb Chocolate
1lb Roasted Barley
The mash grain bill will be: (10 gal finished batch)
14lb 2 row
2lb C-10
4lb flaked oats
.5lb flaked barley
Mash for 90 min @ 154F
I will also cold steep (2qts/lb grain) and add steeped liquid to the last 10 min of the boil
1lb Carafa III
1lb Chocolate
1lb Roasted Barley