One thing that I've found helps me in seating bullets in the Hornet is to work slowly and just barely "kiss" the bullet with the seating stem, then lower the ram and check to be sure the bullet is not tipped at all.
Some cartridges seating will allow a very slightly tipped bullet, the die and seating stem lining it up then seating it.
My experience with the Hornet is that doesn't always work, and sometimes instead of things getting lined up and seating properly the case mouth buckles. Generally this results in a "lost case" that can no longer be used.
So I try to just barely seat the bullet, then check it to be sure its ok, then finish seating it.
I still lose a case or two over a couple hundred rounds loaded, despite being as careful as I can. However, that is way better than the half dozen+ I would wreck (every time) seating them the same way I do .308s.
pain in the butt, but it can be done, and considering the cost of Hornets, its well worth taking pains and doing it right.