I have two Glock 40s, a 35 and a 22. I rarely shoot factory ammo, but pick up a lot of once fired .40 brass at the club that was fired in Glocks. Haven't seen any bulged cases in years. I reload the cases and shoot them over and over until I lose them. Don't think you'll have any problem with brass fired in any Glock manufactured in the last 15 yrs or so.
edit: Perhaps I should add that I don't treat the .40 any differently than any of my other pistol calibers. My standard loads are the 170 Missouri Bullet LSWC to about 1000fps to make major, and the 155gr LSWC from MB to about 840fps for minor. These numbers are from the factory 5.3" barrel in the 35.