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I'm pretty much a volume loader. I have an RCBS powder measure that I had a cylinder made for it that is also calibrated. I use the measure to throw charges set at the calibration that I write down in the log book. When developing new loads, I throw the charges into a scale and develop loads from there. Humidity, temperature, and barometric pressure all effect a scale but the volume, if the temp is close to the same, is far more accurate.
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