look up partial length resizing...thats what you are doing now.....using full length die but not pushing things right back..just enough to chamber properly. as to if shoulder has moved??? in theory,just a little bit,same with squeazing side walls... when doing this on the tiny 7.62x39mm we can see a double shoulder EG can see the die doesnt go all the way down the neck as it would if die was wound right down.
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