I hadn't read about KaBooms until after I purchased my Glock 20 this past Monday. I had a similar event with my 10mm on Thursday, with one factory load casing actually peeling out a little strip of brass. Yikes. I'm told on this forum that I just need to avoid lead bullets, which is what I was using. I've since seen similar precautions. That doesn't sound like the same problem you're experiencing, however.

Glock .40s don't support as much of the case as some other guns. You sometimes see the brass swelling at the unsupported area. No big deal as long as you don't shoot lead bullets, which can cause dangerously high pressures and blow the case (thus, the kaBoom).

So as long as im shooting new, jacketed bullets, the little bit of swelling shouldnt be anything to worry about, right?

Originally Posted by USAFgsm

So as long as im shooting new, jacketed bullets, the little bit of swelling shouldnt be anything to worry about, right?

Nah. Cases swell a little sometimes in the unsupported area. Don't sweat it. Brass is malleable.

Cool, thanks. I guess i panicked a little when i heard about the kabooms or whatever. (of course, not enough to stop shooting it or anything )

The KB stories are what kept me away from purchasing my glock in .40 sw. But from what I have read if you staw away from reloads and choose premium ammo then you shouldnt have much problem. My bud had a 27 and the only problem he ever had was misfeeds. Better than a KB at the range still.

Even with a sparkly clean barrel and shooting jacketed rounds, I see the brass swelling in my 10mm casings too. Guess its OK.