I have only loaded around 750 so far...still fairly new to reloading, but geez the prices of ammo....
I did recently get a S&W 442 for the wifey, and we bought 2 boxes of "factory" reloads at the range which were loaded by a local company. She wanted me to shoot it first, so 5 rounds and hand it over to her. She loads and fires all five, loads again fires one, and "click!" I didn't hear it with ear protection and didn't know she had pulled the trigger. Fortunately she waited 5 or ten seconds and turned (snubby still pointed downrange) to tell me that nothing happened. I opened the cylinder and looked down the forcing cone to see the backend of a fully jacketed bullet. Took it home and eventually managed to hammer the bullet out with a wooden dowel. Next trip to the range I went solo, and took her pistol with me. I got 21 rounds through the gun before the next one felt weak and had a odd sound. I stopped, opened the cylinder checked the barrel, and again a stuck bullet.
The range was good enough to refund me on the ammo, but I'm ordering some .38 dies for my Lee press so the only reloads I'm shooting are my own.
I hope the worst mistake I ever have is a squib, but it is still unnerving.