(emphasis mine)
Okay. I have been playing with this a bit because I couldn't get my version of beersmith to come anywhere near your numbers. No matter how I tried, I got an OG of 1.049 which was close enough to brewtarget's to simply be round off errors.
I noticed that I didn't have a "Light Malt Extract" (I am trying very hard to not use LME, because that has a completely different meaning in this context) in the list of ingredients in my version of beersmith, so I assumed you added it yourself. And then I think I spotted the problem.
You have defined the "Light Malt Extract" as a sugar in beersmith, but as an extract in brewtarget. A sugar is considered completely fermentable assuming your target ABV is within the tolerance of the yeast. Extracts are not. If I replaced your 6 lbs of "Light Malt Extract" with a pure sugar, my numbers suddenly agreed with yours.
So is your "Light Malt Extract" a sugar, e.g., table sugar or brown sugar? Or is it a malt extract? Additionally, if it is an extract, is it a liquid or dry extract? The dry usually has a bit more sugar to it.
Yes. I know. This still doesn't explain why your measurements exactly match the expected OG when using the sugar in the calculations. If it is a dry malt extract and not a liquid, the dry malt has just enough more fermentable sugar in it to make up the difference. The exact difference between LME and DME depends on the tables you are looking at, and will vary from batch to batch of each.
Mik
Here is what is werid. It was classisfied as Grain in beersmith... no clue where sugar came into play. To make things more wonky, I changed it to extract (since it is) and it showed my OG as 1.041 which is NO WHERE NEAR where it should be. I don't know how your getting 1.049 in Brewtarget as I get 1.047. I am using their ingredients and their stuff and hit it dead on like I said. This is confusing me even more now.