I agree, 1 or 2 10'ths isn't enough to be concerned about unless you're loading near max in which case you'd be trickling them up to precise weight anyway.
When I get a new jug of powder, I set it and throw 10 charges to get an average, and plug the info into the chronograph math sheet, record the extreme spread, avg spread and so forth. I then scotch tape this info onto the powder jug. (I also weigh one charge where the measure is tapped / bumped to let me know what I could expect in overage if something unforseen happens.) Also record which measure the test was done on (RCBS-DILLON-etc.)
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