I have the RCBS manual powder drop and RCBS Balance beam. I dont use any other weighing tools. When setting a powder load, I drop from powder drop until I get the right amount confirmed by beam scale. I confirm it several times from both. Once I have the right powder drop, dropping at correct measure in grains, I start filling cases. Every 5th round, I confirm against beam scale. Finally, once all cases are loaded, I inspect each case with a flashlight to ensure all filled cases are the same volume.
10 yrs - never missed a drop or filled case...how did I end up doing this...10 yrs ago...not checking, not confirming loads (dropped by powder drop and confirmed by flashlight), one day I was out with .223 and fired a round...it sounded odd, so I stopped, unloaded and checked barrel. Sure enough it was a missed powder drop and the primer had enough force to push the 50gr VMAX into barrel, but not far. I still shudder to this day if I did not hear that squib load and glad I was on crownland, and not an active range and could hear it.
Check, double check and then triple check. I dont think I could use a turret press, or Dillion to load...I would still need to check each case visually. My two cents