I recently got reloading equipment for my rifle in .270 win. I'm not really sure on the resizing part though. The bullet (130 gr soft point) sits on top of the case mouth. I can't neck size because that will just make the case mouth smaller and I don't want to full length size because its fire formed for my rifle. Is there a way I can just expand the case mouth without sizing the rest of the die? I'm a little bit confused on this part. I have a Lee die set.