Crickets.
You are a fu cking idiot. That is an old trick to reduce run-out. It's also the way I set all of my dies and I get far better accuracy than most do here. How do you fare at shooting and accuracy? Until you can start proving you know what you are talking about, I'd suggest you shut the fu ck up.
If you can set that aside for a minute, could you explain how/why adding crimp straightens out a crooked round? Show us your runout numbers and explain what the mechanism is that straightens out the rounds when you crimp.
I could picture maybe if you've got a sticky expander ball pulling necks out of alignment, that adding a crimp might push the neck back down into place. Not sure what other mechanism could be responsible for the straightening.
Never experienced that phenomenon myself, but maybe that's because I can't shoot, like most everyone else here.
