Got together with a few gents yesterday and whipped up a batch of IPA. Columbus, Centennial and Cascade took center stage. The beer was suppose to clock in at 1.067 with a IBU rating of about 60. Turns out, I collected too much and boiled too little, I ended with a gravity of 1.058-1.059. Not sure what this has done to me hop utilization numbers but I imagine the end result will be a touch more bitter than intended. My brew software puts me at 63 IBU or a BU:GU of 1.06
During my original calculations, I anticipated a 85% mash efficiency and a pre-boil volume of 31L. I actually collected between 32-33L, (my 34L boil kettle was full!) and the mash extraction efficiency was slightly lower, 81%. In regards to the lower mash efficiency, I used a different base malt which had a slightly lower extraction (36 ppg vs 37 ppg) which alone may have accounted for a 1- 2pt loss on my final gravity numbers.
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