The Lee FCD is the only die I'm aware of that will swage your bullets when crimping.
I suppose if your brass is thick and hard, and your expander is too small, and your bullets are soft, they could be reduced in diameter when seating, but otherwise your expander won't swage bullets.
Separate seating and crimping dies won't affect whether or not your bullets get swaged.
I stopped using FCD dies, don't need the training wheels.
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