I've never used promash, but I did download Beersmith for the trial.
I noticed that some of the calculations for OG and IBU and AAU don't come out the same as if I do the math based on the book that I have.
Does anyone know what they use, for example, for the amount of isomerization for, say, 60min in the boil. The book I have says 60min = 30%, 30min = 21%, ...
I know that different people use different tables to figure this stuff out. Which one is correct?