I just finish a double brew day this past Sunday. They were my 4th and 5th batches since I started home brewing in August. My first 2 batches the Original Gravity was off and I figured out why. My 3rd batch I nailed it as with the 4th batch. I was feeling pretty good until my latest batch, the 5th batch. It is a double IPA or Imperial IPA. The Original Gravity should of been at 1.072 (according to the recipe), but mine was 1.042. I took the reading after oxygenating it (just like the previous 2 that had the correct O.G.) One thing that I did different was used a combination of Liquid Malt Extract and Dry Malt Extract. The recipe called for .5lb Munich Liquid Malt Extract (I used all liquid for this) and 8.5lbs of Pale Liquid Malt Extract (for this I used 6.0lb of liquid malt extract, and 2 lbs of light dry malt extract. I used 2 lbs instead of 2.5 lbs dry due to subtracting 20% of the weight when converting from liquid to dry).
The only other thing was my hops added at 0 min (1.5oz) I forgot until about 5 minutes after taking it off the heat. What are your guys thoughts on all this? I still think the beer will turn out great and it is fermenting like crazy as we speak. Thank you in advance.