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I use Lee FCD's on all my rifle cal's up to 444 and they work fine for me with lead and jacketed. You indicate that the case mouth is seated to the middle of the cannelure before you crimp. Perhaps the bottom of the crimp groove is being forced deeper by the constricting of the case mouth? Maybe too much crimp? I'd experiment with that theory by long-seating a boolit so the case mouth is nowhere near the crimp groove before crimping. See if the same thing happens.

If you get consistent OAL's after crimping does the shorter OAL matter to the gun?
 
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