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The .40 is just a 10mm short, or the 10mm is a .40 magnum. Some people have been playing around with reloading the .40 to 10mm ballistics, which is not surprising since the .40 case is just as strong as the 10mm, just shorter. I wouldn't shoot those hot loads in my aluminum frame SIGs (at least not make a habit of it), but I would in steel framed guns, or in Glocks with a fully supported chamber. The 10mm is not as popular in ammo sales, but a lot of people like it (despite the fact that it is only slightly more powerful than the .45 ACP).One poster on NWF pointed out that it took 100 years for the industry to replicate the ballistics of the .38 WCF (30-40) cartridge with the 40 S&W. But it is indeed a rimless cartridge! And doesn't make as much smoke as the black powder original.
What I like about the .40 is that it is more powerful than the 9x19, but can be found in 9x19 sized guns, has only slightly more recoil than the 9x19, and noticeably less than the .45 ACP, with the same ballistics as the .45 ACP - at least in my opinion. The only real downside for me is that I lose 2-3 rounds of capacity (sometimes more) in the same sized mags.