Mark down my 4th all grain batch in the record books! I can't believe how smoothly everything went today. Of course I undershot my mash temp but a kind soul was available via text for a quick response! Oh yeah, mental note for next time...when boiling 4 gallons of wort in a 10 gallon BK, remember that your immersion chiller is somewhat pointless in chilling 3 or so gallons.
So my pre-boil OG was 1.041 (1.043 estimated in BeerSmith) and the post-boil OG was 1.056. BeerSmith called for an estimated post-boil OG of 1.051 and I'm curious why the big difference? I did have a pretty low mash temp, and mashed for 75 minutes...not sure if that matters in this case.