I seem to remember a few years ago that @Muir suggested the technique that you could spring the crimp / break the grip initially by pushing the bullet in a few thou with your seating die before you then getting out it with inertia hammer or puller, if the crimp was buried in the bullet.Hard crimps can be bypassed by technique. Repeated blows on the press lever with the flat of the hand, it's a learning curve.
Alan




