Don't have one, but if I was worried about accuracy I would weigh several target-type bullets in the weight range I used most. That would get you down into the rifle-charge arena, anyway. In working up loads, you'll start 5% or so under, anyway, so exact one-grain, +/- gross accuracy is less important than repeatability for the next time you load.
Any college around with a physics lab? They'll probably still have old brass weights for beam-balances. Might have fractional-gram weights, and you'd be down in pistol-load range.
Any local engineering labs? They'd probably be happy to check out your scale; probably not even charge anything.
Best luck, Art
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