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BigJake: I can attest that it's indeed possible to buckle the shoulder of 223 brass, using the Lee FCD. (You have to really try hard, but it's certainly doable.)
I don't believe the crimping action of straightwall FCD's is such that buckling is a problem, as you're only crimping enough to remove the bell, unless you're roll-crimping. However, there is a distinct possibility of occasional bulges caused in the seating process.
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