Magtech/CBC
I have used Magtech in 9 MM in the past with no trouble.
However, I recently bought on of their 250 round bulk packs of .38 Special. They went into the guns fine, but after firing I needed my pliers to extract the empties from my revolvers in about 1 round in 5. About half of the rounds did not slide out easily after firing like they should.
I experienced this with two different revolvers and have never had this happen with any other ammo ever. I noticed the casings were marked CBC, not Magtech, and I see by the Magtech web site that they recently merged with CBC (Brazil), Sellier and Beloit (Czech Republic) and some other outfit.
It's normal for the casing to expand and hit the walls of the cylinder on firing, but it should bounce back a little towards it's original size after hitting the cylinder wall. I attempted to reload some of these, and found they were more oversize than other casings I was reloading, and re-sizing took a lot more grunt on the press. My guess is there was something not quite right with the metal they made these casings from. No elasticity.
I tossed the rest of the empties I had. Something was just not right with those casings.