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OP stated the scale he used was a RCBS balance beam. When setting for 10.9 grains, getting it on the 19.0 grain setting is very easy to imagine , 19 grains will fit in a 45 Colt case and all three would be the same level.
I did the same thing, years ago, had been loading for 2-3 years, Redding #1 beam scale, set for 10.5 grain Unique for 357 Magnum load with 110 grain Super-Vel jacketed hollow points. Ruger Blackhawk held together for 5 rounds but empties had to be driven out with a rod. HOT, HOT !
Yeah, you guessed it, had the little adjustment set for 15.0 not 10.5, very easy to do and understandable. Sometimes I have moved the adjustment accidentally while weighing.
I'm thinking most likely a 19 grain charge did the deed.
MarkJD, I'm glad no injuries, guns can be replaced, things like fingers and eyes can't. About the only thing you can do is be careful and double check things...heck sometimes I triple check things involving powder.
Be careful, load safe....Gary
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