Factory ammo isn't immune from defects. Learned a valuable lesson before I retired from LE. Years ago, the Dept. got in several cases of new .38 Special ammo with the S&W brand. Don't know which company loaded it for them, doubt that Smith did. One of the rounds I was issued had a slight bulge where the case mouth joined the projectile. In a speed loader, it would have been impossible to load any of the rounds with the defective cartridge. I saved it to show the S&W rep, and the FBI PFI. The FBI PFI relieved me of the cartridge, and sent it to Quantico.