Not yet a year under my belt with this craft but I do have about 10 batches worth of learning so far and I am focusing in on 3 recipes I like that and while looking at my records I am seeing some swing in the numbers of one recipe while the other 2 are with in a few points of each other. For instance, ABV and SG.... This second batch of Blonde I just put up is looking good within one point on its OG of 1.050 where my first batch was 1.049 and my Brown has got numbers that are + or - .05 points with the OG, FG and ABV but the Porter I put up a couple of weeks ago has been all over the place. 1.058 and 1.050 OG then 1.010 and 1.023 FG with ABV's of 6.3 and 4.3, While the OG was not too far apart, the FG is some 13 points and a full 2% difference in the alcohol! So the question has to do with repeatability. How far off some target number is close enough? What kind of tolerance is there within the system and how much of a delta do you need to have where there's a discernable taste difference?