Kev, I'm assuming you're using a three-die setup for your reloading. First die sizes and decaps the case, second die flares (bells) the case mouth to receive the bullet and the third die seats the bullet & applies a taper crimp. If you don't have enough flare (bell) from die #2, you'll crumple the case neck like you mentioned when trying to seat the bullets. Screw the expander ball down a little more in die #2 and you'll have an easier time seating the bullets.
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