What concerned me is that the instructions that came with the RCBS dies say that too heavy of a crimp can damage the case.

I have a question about the Lee Crimping Dies. I looked them up in Cabela's and the description says ""the carbide sizer sizes the cartridge while it's being crimped". I don't understand why I would want the cartridge to be sized after I have already sized it, expanded it, and seated the bullet.

Would I use that for a separate step after seating the bullet? Will a Lee die fit in a RCBS press?