I buy the Dillion dies myself. The Dillon seating die is "designed" to seat the bullet straight. That's it's main goal. It will seat your bullet absolutely correct. They don't try to crimp in the seating process. The Dillon crimping die does the crimping . Dillon does not design a die to seat and crimp in the same operation. Dillion does not think it is a sound reloading for a die to seat and crimp in the same operation.
That said, I will exchange the dillion sizing die with a Lee sizing die to size the brass down lower on .40 that has been shot in glock pistols. The Lee die will get the Glock Bludge out of the brass when the dillion will not.
There's gonna be a lot of slow singin'
and flower bringin'
if my burglar alarm starts ringin'