BTW, I'm also in the middle of fire forming brass 9.3 X 74R cases to make full length .410 brass cases out of them, in an attempt to squeeze a little more shot in them. Just a little fun project. My theory is that there will be greater case capacity with the brass cases over plastic hulls.
I found a lab that will pressure test them for me when I get to that point in the process . . . . maybe next spring.
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