"I don't agree that the pressure difference (if any) can be attributed to the volume of the shot column."
This statement could not be more wrong , especially when dealing with loads that are close to max pressure . It can get dangerous really quick.
In the case of Victors' loads he increased the column height in the lead loads with 2 16ga ocs cards to make the load crimp well . Now take the same lead load with extra filler and substitute bismuth and have it tested and the pressure of that will be greater than the original bismuth load .
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