Didn't do anything for me and if you over do it you will get wonky case necks. But it has worked for others so I can't make any hard and fast claim.

Why do you want to crimp? If for a hard kicker or auto maybe yes but for anything else adjusting neck tension is better and I would invest in a collet die before getting a crimp die if accuracy is the objective. Lots written on how to tweak them for best work.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli