My lyman seems to go alright...it does drift occasionally but it prompts you to zero if it does,goes over most of the time without the restrictor but with it in it is bang on most of the time or stops .1 low.
Also it seems to be relatively waterproof which while not really a feature required in a powder dispenser is quite handy all the same cos mine has got quite wet twice due to plumbing issues and still goes good
I think if you absolutely must be within .1 of a grain or better then these and the chargemaster/hornady etc are probably not for you.
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