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BW,
Since the .40S&W headspaces on the casemouth, (as previously mentioned) all that's needed is a good taper crimp. One that allows a nice edge on the case mouth to be visible should be sufficient. In other words, if it could be possible with the standard taper dies, and if you were using a cast, or lead bullet, don't crimp the case mouth too far into the bullet so as to lose the edge.
Jacketed bullets probably wouldn't allow it anyway.
Take care,
Bob
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