Out West,
While the change from the 9mm to the .40 was not due solely to the failure of the 147 grain round, I don't see many departments changing back from the .40/.45 to the 9mm unless there is a very compelling reason, i.e., the documented, continued problems with the Glock 22. Admittedly, the 147 grain round has advanced over the last ten years, but I don't see an agency going to the 9mm from a larger caliber just for an improved bullet design.
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