I've not done the actual measurements, but I have seen data from others who claim to have done the work. Not much of a concern unless you're working near max, I think. But if I'm working close to the edge, I want every component to be the same. If I change something, I'll work up again.ATLDave, how much have you seen volumes vary? I guess if I had time I could zero some empties on my scale and fill them with water to check the difference, but would you say it is 1-2%, 4-5%, up to 10%? Like I said, I can see how it will affect velocities but starting out I am more concerned about pressures and such. The manuals usually say what kind of case was used but not how to adjust any of the loads when using different cases. But I think your method of final weigh-in of the loaded cartridge is a good one, and I understand what you mean that if it is over a couple grain difference then it is cause for alarm.
But the QC is the main reason.