So i just bought a whole bunch of hops from the LHBS, and all but two variates where a higher A.A than my online recipe calculator, nothing like having to re-adjust your recipe after your purchase, my IPA was raised about 14IBU's before i redid the addition times and my ESB was raised about 19IBU (also due to the fact the my intended variety (Glacier (5ish A.A) was mixed with Galena (11.4 A.A)), but still glad i was able to rerun the numbers before i brew tomorrow. I know that the A.A% changes from year to year and even harvest to harvest, but these differences could really affect a beer if your not careful.
Anybody else have experience with this?