I reload my .40S&W cases shot through various Glocks (Gen 2, 3, 4) many, many times. I have about 4,500 cases and shoot about 1,000 per year of this caliber. I pick up range brass, gravel pit brass, etc, or get fired brass from friends. I figure I only toss about one case per couple of hundred reloads for split neck, and lose in the dirt about 3-5 cases per hundred shot. I've been shooting and reloading the .40 for about 30 years and still have some of the original cases I started with. Up until 2008 I had maybe 700-1,000 cases I had been using for the prior 20 years. Then I started really collecting them seeing a shortage about to come on in early 2008. This is about the same rate of loss I see with 9x19 Luger as well. I typically load to no more than .5 gr under max as that is usually good accuracy and I see no need to try to push the .40 limits. Never had a Glock bulge, loose primer pockets (or in any handgun cartridge) or anything else out of the ordinary compared to 9mm or .45ACP.