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"...Dillon says they are carbide..." Carbide die sets mean the sizer die has a carbide insert. It doesn't mean the whole set is made with carbide inserts. Bullet seating and crimping doesn't require lube and therefore they don't need to be carbide. You'll note that Dillion's picture clearly shows just the sizer has the insert.
Carbide isn't easily machined and is brittle stuff too.
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