What are the easiest mistakes you learned the most from when reloading?

I have a RCBS electronic powder scale. More than a couple times, I forgot that I left the hole open that drains the powder out of the scale. When I go to put more powder in, it dumps out all over the place as it drains out the hole in the scale.

On a progressive press, I stay away from flake powder. To many light loads that can stick a bullet in the barrel.
 
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