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The Range
Handgun Discussion
Is .40 S&W Dead??
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<blockquote data-quote="SoonerP226" data-source="post: 2842814" data-attributes="member: 26737"><p>The infamous 10mm FBI Lite, developed because "female and smaller male" FBI agents had trouble with the full-house 10mm, did become the .40S&W. </p><p></p><p>10mm and .40S&W factory cases aren't interchangeable, though, even if you trim the length on the 10mm. .40 started as a shortened 10mm (which was actually .40cal), but the factory .40S&W cases differ in two respects. First, the 10mm uses large pistol primers and the .40S&W uses small pistol primers. Second, the 10mm has a thicker "web" at the base of the cartridge than does the .40S&W, so if you cut 10mm brass down to .40S&W length, you end up with slightly less interior volume in the cartridge, which means you'll have more pressure on ignition. It may not be enough to make a difference (I don't recall), but you still run the risk of overpressure.</p><p></p><p>Personally, I never cared for the .40S&W as a shooter; it just has too much extra bark for not enough extra bite. I rather enjoyed shooting 10mm (what's not to like, with .357Mag ballistics that feed reliably in a semi-auto?), but not so much for its baby brother.</p></blockquote><p></p>
[QUOTE="SoonerP226, post: 2842814, member: 26737"] The infamous 10mm FBI Lite, developed because "female and smaller male" FBI agents had trouble with the full-house 10mm, did become the .40S&W. 10mm and .40S&W factory cases aren't interchangeable, though, even if you trim the length on the 10mm. .40 started as a shortened 10mm (which was actually .40cal), but the factory .40S&W cases differ in two respects. First, the 10mm uses large pistol primers and the .40S&W uses small pistol primers. Second, the 10mm has a thicker "web" at the base of the cartridge than does the .40S&W, so if you cut 10mm brass down to .40S&W length, you end up with slightly less interior volume in the cartridge, which means you'll have more pressure on ignition. It may not be enough to make a difference (I don't recall), but you still run the risk of overpressure. Personally, I never cared for the .40S&W as a shooter; it just has too much extra bark for not enough extra bite. I rather enjoyed shooting 10mm (what's not to like, with .357Mag ballistics that feed reliably in a semi-auto?), but not so much for its baby brother. [/QUOTE]
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