You gotta mean .1-.2. If you can't hold to 2 grains, you need to take up knitting.
As above, run a lot of pulls thru the measure. At first, they're way off, but the more you use it, the better it works. Stick powders typically have a graphite coating that lubes the works of the measure. The other thing to look for is static.
.1 pretty much doesn't mean diddly in the real world. There are measures that do a little better, but be prepared to pony up big bucks for a little extra precision.
Do yourself a favor and buy a $5 RCBS powder trickler. Drop to within .2, then trickle the rest if being within .1 is a big deal. I use the a"crap" Dillon measure on my 550 and it typically throws Varget to +/- .1, maybe .2