If some of the FBI agents hadn't complained about the recoil of the 10mm nor created a "light" load for it do you think the .40 would have still been created since this is what it was the answear to?Granted I have my history correct.
surfinUSA said:Recoil was only one issue. The 10mm requires a large framed gun, which of course are big and usually heavy.
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I forgot about frame size of the gun when I made my post.Now that it has been mentioned I can't think of another auto pistol round between the 9mm and the .45 unless you count the .357sig but that is probably another discussion in itself.
I think the demand for something more like a .45 but in a 9mm package for carry led to the popularity of .40S&W, if not its initial development.