My experience is that the electronic scales in the RCBS chargemaster combo are stable enough.
I test a small hex nut that weighs 44.3 gr about every 20 powder throws. Perhaps 1 in 5 times it will weigh at 44.4 gr.
This is over about 5000 rounds loaded and 10+ years.
On range testing at 100m with 2 different rifles Ive found the mpi stable over ranges of +\- o.2 gr at least so for hunting this is good enough. Im not shooting long range target, where small velocity variations (ES) can be of interest.
Ive recently got a Frankford Arsenal nranded $100 digital scale and it also seems stable in my environment but I havent used it much yet.
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