I got home last night& measured the expander on the 7.62x39& it is on the small side of .311, and I have 3 batches of cast boolets, 150fn, 170 fn& 193 rn. all measure .311. and the brass springs back a bit so I have .001-.002 interference fit. To tell the truth, I may not even need to size the neck after firing it may already be .311 if I don't size it back down.
Being this is a bolt gun, do I really need to worry about crimp?
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