Good article about the fading popularity of .40S&W ammo for law enforcement and civilian use.
http://www.thebangswitch.com/the-fading-40/
Very interesting article. The pistol-training.com article linked to at the end of the above article is very interesting, too.
There must be some reason why a nominally 9mm-diameter bullet has been the most popular handgun bullet size for a long time, well before today's advanced hollowpoint bullet technology:
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And why, out of the above 9mms, the 9 Luger has been the world's most popular handgun cartridge, again prior to advances in seen in current hollowpoint bullet tecnology.
It seems that, putting economics and availability (in a normal market) aside, the edge for the 9 Luger is due to reduced free recoil energy. For example, the free recoil energy of the .40 S&W in a CZ 75 B and that of the .45 Auto in a CZ 97 B is 6.42 ft?lb, while that of the 9 Luger in a VZ 75 B is only 4.12 ft?lb, lower by 35.8%. You can't drop what you can't hit.
The big-bore advocates argument has always been that more range time will compensate for greater recoil. However, in a post-constitutional socialist market where ammo is expensive, if you can find it, the big-bore solution becomes impractical.