Quote:
Originally Posted by Mark Garrett
"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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I doubt it -- show me some data to support your claim. IMHO The filler would change the pressure only because the entire payload is slightly heavier but the volume being greater due to filler has very little effect. It's the weight of the payload that makes the most difference.
Try just light weight filler and no shot at all -- put a bunch in, try different amounts -- you'll see very little difference.