I am not sure about this kits details
FA and FG
FG is measured in Fg , FFg , FFFg, FFFFg when measuring it passes one screen but stops on the smaller meaning you get a very consistent size grannual
FA as I understand it is measured with different screens and includes what passes so you have a much wider range of grannaul size including a lot of fines.
I started asking some what similat questions about black powder a few years ago that some of you may have, here you can see the education on it I got.
http://castboolits.gunloads.com/showthread.php?208326-Ffg-fffg-ffffg-vs-ffa-fffa-ffffaif your wondering what I ended up doing , bulk 25 pound bag of Shutzen 3fg at 12 dollars a pound this spring the current price. at the time I had asked these questions I had just bought up enough of the old elephant old stock to get by for a while back when I was asking questions about this and I collected up enough powder canisters to house all the new powder for the bulk 25 pound purchase.
we go through about 5-6 pounds a year with the 4-H and some running a training clinic so it will last a few years
if you have a few friends buying 25 pounds at a time is the most cost effective way , but it comes in a cotton sack in a plastic bag.
most of our target work is 30 gr loads and some up to 60 gr for targets out around 100 yards. so it comes to between 5 and 10 cents a load for powder , patches are running about 1.5 cents and I cast the round balls from lead we got donated form a local excavator who removed some lead water pipe a few years back.