Thanks for posting this, OP.
Good reminder for me, and timely.
Have reloaded many many thousands of rounds for handgun (38/357, 45acp and 9x19) but it's been a few years since I had a bench set up (I have a 3.5 year old, 'nuff said) but am now at a point where I'm getting back into it and just got all the stuff to load .30-'06, which is a whole new ballgame.
I often phase in and out of hobbies and usually it's like getting back on a bicycle, so the risk of being complacent with reloading is high - until I read this thread!
You, dkyser, have probably prevented at least one of us from having a similar accident, thank you!
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Regarding emptying hoppers at the end of a session, I don't like to and think it's more risky to make a screw-up the more you transfer a powder.
Like my old chemistry teacher told me,
you never pour a working solution back into the stock container.
Of course people need to tailor their practices to their setup and equipment; I reload handgun on a pair of Dillon SDB's with powder hoppers.
When I add powder to one I write the name of the powder on a scrap of paper and toss it in before I tape on the lid with masking tape that I also label with the powder name and date and my initials.
It stays in there until the hopper runs dry; if I decide to switch powders or calibers and there is a little left I'll either load up the remaining or discard it, it does NOT go back in the stock container.
