Most complaints I have seen in the forums and gun mags have been with .40 S&W. My only big bore semiauto is a .40 (G23) so I watch the ammo closely. It isn't going to make me switch to 9MM, but I just take one more step (checking ammo after chambering) for safety. I normally carry a J-Frame Smith in .38 Spcl, but I have found inconsistencies in out of the box commercial ammo even in the .38 Spcl. If any of my ammo is 2 SD (with a significant SD factor) out of tolerance with the mean for the lot, I don't shoot it! As said above I have found the brands that are consistently in tolerance and those are the ones I carry. Checking after chambering just adds one more step for my Glock ammo.