You have two critical measurements for your revolver rounds - the powder charge and the OAL length. Weighing completed cartridges tells you nothing as mentioned by Jim.
I reload in batches on a single stage as I do not shoot the volume that Jim does in handguns. I drop 10 powder charges and dump them right back into the hopper and then weigh the charge. I keep the hopper filled between 1/3 and 2/3 full and I use the same type of stroke so the vibration treats each drop the same. My RCBS Uniflow can deliver a consistent drop, even with light loads for small cartridges like 32 ACP and 32 SWL, cartridges where, like Jim mentioned, the difference between start and max is maybe .5 grain
Go over your methods and determine why your powder drops are inaccurate
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