In many (most?) of the Glock KB! discussions that I've read about, the shooter was using Universal Clays powder. There's several possible reasons for this; maybe the powder is unusually sensitive to pressure spikes due to bullet setback or slight overloading, or maybe the powder is so good that almost everybody uses it and it crowded out the other powders -- in which case this is meaningless.
Just in case it's the former rather than the latter, be careful. .40S&W is not a very forgiving cartridge.