If I had to guess, I'd say that your bullet seater die is screwed too far in to the press. Not the knob on top of the die, but the entire die body itself.
I believe it is attempting to crimp the case, but FAR too much.
Twirl it out one full turn, and turn the knob -IN- one full turn to compensate for the setting of the bullet seater.
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Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.
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