I read many articles and reviews before putting the Lee collet crimp behind the bullet seater on my press. The way the LCC works doesn't deform case necks unless you try very hard to. It may not be necessary but never found a test where it hurt either. It's one extra pull per cartridge is all.
It did nothing to hold in the Winchester 64 gr. PP's that I bought though. I kinda wanted those to work too.
