For decades the FBI claimed the .40 Smith & Wesson was the optimal personal defense round. But the 9mm versus .40S&W battle rages on. (Photo by FBI) Defensive caliber arguments have been going on ...
Summary: The debate between revolver cartridges like the .38 Special and semi-auto handgun cartridges such as the 9mm is often considered pointless by enthusiasts due to their distinct differences.
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