I do happen to have a hornady die set for 7.62X39 When I get home, I'll have to take my calipers to the expander.
I have several boxes of cast boolets, 150s, 170's& I think 190's. but was shaving the lead seating them. so set the expander long, and run the cases up till it just flares the mouth& since I don't normally crimp, add that step?
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