So I'm having a hard time understanding this problem here and I'm going to apologize in advance to the other side but here it goes. If 1600fps out of a stock glock barreled 40sw is doable then what's the point of the 10mm. Just trying to wrap my head around this. How is the parent cartridge weaker then its cut down offspring? I'm getting case bulging long before I get anywhere in that general ballfield. Am I missing something? Did I buy the wrong gun? Should I sell the 10 and get a 40? Again I'm not trying to be mean to another member just asking if I have been using the wrong cartridge. Wanna kill these ads? We can help!