First, lube generously. I was having the same problem with Winchester cases and a Lee die until I started lubing way beyond what I need to with regular resizing. Second, make sure that your neck expander is set low enough that it doesn't catch the neck while it's being sized down.
Now I don't use my Lee die anymore for necking down. I have a Redding die for that now. But I was able to successfully neck down 7.62x39 with the Lee by using some premium synthetic motor oil. That's probably not necessary, but a good liquid sizing lube is. With the Redding, I have had no problem sizing down with Hornady One Shot.
Will
Now I don't use my Lee die anymore for necking down. I have a Redding die for that now. But I was able to successfully neck down 7.62x39 with the Lee by using some premium synthetic motor oil. That's probably not necessary, but a good liquid sizing lube is. With the Redding, I have had no problem sizing down with Hornady One Shot.
Will
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