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You need to watch out for drafts and breezes in the room. They'll throw things off. If you weight the same drop of powder three times, you shouldn't be off by more thna 0.1grs. If it's out, you may want to clean the fulcrum things.
I shoot competitive highpower rifle and do pretty good at it. I can live with up to 0.3grs variation from one charge to the next (although I use a Harrell measure which is rarely outside of 0.1grs). At short range (300yds and less), it really doesn't matter. At 600yds, it might matter. I do generally weigh each charge for 600yds (as do many if not most highpower shooters), but I must say that my personal best score was with as-thrown charges (194-10x).
Additionally, some loads will be more sensitive to variation in charge weight than others. I do all my load development measuring only every 5th charge. If a load only shoots well if I measure each and every one, then I'm not interested in it.
Ty
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