Welcome to the board.

I have two glocks in .40 S&W 23 and a 27. The Kabooms are because the .40 glocks have an unsupported chamber. If you look at your spent brass you can see the bulge at the base were it faced the unsupported part of the chamber. For this reason I do not hand load for my .40 glocks. All the KB's came from reloads. I know people who do hand loads and they don't have any problems you just can't get carried away getting to hot. They also make special resizing dies for this very problem.

If you shoot factory ammo you will never have a problem I have put thousands of rounds through mine with no trouble.