When I first started reloading I had this same problem with the three die set. Easy fix. Use your three die as if it were a four die. Instead of seating and crimping at the same time use it in two different steps.

If you don't want to do that then cool (but I found that simply using it as a four die ends up saving time in the long run because you save time on the setup). The problem you are having is the die is too far down. If you are going to set the bullet and crimp in the same step then you have to set it up at the same time. You can't set your bullet depth, and then set the crimp, you have to do it at the same time or your die will be screwed down too much and will crush the case.