Exactly... its not as if a bullet leaves the bore in perfect condition.. the core is squeezed and deformed by the rifling more than a properly adjusted crimp die deforms it.... But like the die, its doing it from all sides, so no harm is done to the bullets flight....
This hypothesis is not sometime that I am going to spend time and effort testing.
But you can.
When bullet crimpers start winning National Championships I will start crimping bullets.
All you have to do is excel in competition. Results count. Go win a few for the crimper.