Quote:
Originally Posted by armadillo
The .40 was developed after tests by the FBI and others to find the best overall cartridge for law enforcement. I think most members here will say: the 45 has more knockdown power, but shot placement is "king."...
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Actually I believe the FBI settled on the 10mm as being the best cartridge, but so many of the agents had problems with the recoil that the backed off to 10mm light (.40 caliber).
If you can handle the recoil (and the expense) then for law enforcement the 10mm probably still is king. Improvements in barrier penetration in the last few years has reduced the edge that the 10mm has over the .40 though.