Hmm, are you expanding enough that you can "stick" the base of the bullet in the case? If so, is it straight going into the seater? If not, why? If still crooked, call the die maker.
Next, I think your crimp is in question. What is the case diameter right at the end of the case? Should be .469 - .471, if memory serves me.
Last, do your loaded rounds drop freely in the barrel and freely drop out just by turning it over? This is the plunk test.