A couple suggestions 
1) Let the electronic scales stay on and idle for at least 30 minutes before weighing something
2) Check the electronic scale with a check weight
3) Make sure the scale is on a level surface that isn’t subject to vibrations from stuff moving around
4) Make sure the scale is protected from drafts

All of the above have varying degrees of deleterious effects on sensitive balances.  Cold electronics will tend to wander more than warm electronics.  Out of level balances don’t weigh accurately. Drafts/vibrations cause the weight to wander.

0.1 grains is about 0.0065 grams.  A laboratory balance that measures to 0.001 or worse 0.0001 is a lot more expensive than one that does 0.01 grams.  And the more precise analytical balances are finicky and don’t like to be turned off, moved, out of level, vibrated, or blown on.

My reloading room is in the basement, which is cold, and the furnace is running and I have a space heater on, to boot!
Next time I try this I will bring the scale upstairs, let it warm up, and try again. I think ambient air temp and not letting it warm up is the likely culprit. I did test both with check weights to confirm results. 
Thanks!
Joe S

I use an old Redding “hydraulic” powder scale set up and zero’d at eye level. I added a stop bumper on the pointer scale a half a grain over upper limit which is a red line at +/-.1gr. The stop bumper greatly reduces the oscillation time as it immediately limits the upper travel of the beam. I can do a couple hundred bullets an hour. In time you can easily predict the outcome even before the beam stops.

Ill add that because I am offgrid, I rely as little as possible on ANYTHING electronic.

One other thing that can affect those electronic scales is other electrical devices nearby. Especially fluorescent lighting above a bench. I had a friend whose fluorescent lights that would affect his scale and when he turned them off they worked fine with a flashlight. He finally went to LED lights that don't have a ballast and that solved the problem.

Cat_Whisperer wrote on Jan 8^th, 2025 at 9:51am:


Then you go poke a button every 4 minutes and 59 seconds until it warms up and get stable.     Or buy a non-battery operated balance that doesn’t turn off faster than it warms up.  FWIW, the RCBS dispense/scale the OP is using doesn’t suffer from this auto off problem.

I have an old Pact also.  A couple of years ago I had an issue with mine.  I called Pact and the tech gave me a reset procedure and it worked.  I will post it when I get out to the shop.  I primarily use the gen1 chargemaster for weighing everything.  I have it plugged into a dedicated circuit that is not connected to any fluorescent lights and I added a choke to the power cord.  I also let it warm up for 1 hour when it is below 60 in the shop.
FWIW,
Steve

A few years back there was a post about adding a ferrite? Coil to a scales power cord that would help. I was having this issue a few days back in my cold space heated shop while measuring some Swiss BP trying an experiment where I would weigh each charge and compare range results with unweighed charges.  I wound up having to weigh each charge twice as some would be up to .4gr high or low after the first weighing.  Even with that I had one load that had less compression needed.  I added an arbitrary scale to my Lee hand press so I can tell how much the powder gets compressed after a 24” drop tube.  I ended up sorting the loaded cases by compression and will track velocity and accuracy when I shoot them. My hope is that the unweighed rounds work as well as the weighed ones. 

Jack