The 40S&W cartidge is a fairly high pressure cartridge, and Glock .40S&W chambers do not fully support the cartridge case.

From the Buffalo Bore Ammunition website:
40 S&W WARNING
"This data is intended for use in firearms which fully support the cartridge in the chamber. Use of this data in firearms which do not fully support the cartridge may result in bulged cases, ruptured cases, case head separation, or other conditions which may result in damage to the firearm and/or result in injury or death of the shooter or bystanders."

I'm not sure about the other calibers, but Buffalo Bore doesn't have the same warnings on their 9mm, .357Sig., 10mm, or .45ACP ammo. However, the Glocks do not have fully supported chambers in 10mm or .45 ACP, as well as .40S&W. But from what I've read, the Glock .40S&W's seems to be most susceptible to case bulge, case ruptures, and case head separation. I have no personal experience with these issues as I neither own, nor have the desire to own, a Glock. For what it's worth Glock recommends the use of only new manufactured ammunition, use of handloaded or remanufactured ammunition voids the Glock warranty.

Cliff

 
 
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