If you're using a Hornady bullet, are you also using a Hornady load manual? if not, that would be the place to start. Hodgdon manual also has data for the bullet mentioned.

Crimp just enough for good ignition and burn and to to keep the bullet from moving under recoil. Any more can distort the bullet which does nothing for accuracy. A lot of people seem to like extra heavy crimps that are not needed.

This all requires a bit of experimentation and some group shooting from a benchrest.