Well, the problem is the federal girly men couldnt take recoil so they made a 10mm "fbi load" with reduced recoil. It was a basically a long cased 40, somebody was like "hey couldnt we make the cartridge shorter? and 40 s&w was made, became wildly popular, and 10mm auto was almost completely ignored, but recently made some comebacks. Many 1911s, the glock 20/29, and even the bren 10s coming back
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