I work pretty close to their Houston store. Was looking for some .357 Magnum for a Marlin about a year ago. They had one of the best prices going, so I went to check it out. The rounds on the shelf (I opened multiple packages) had never been crimped after seating the bullet. The mouths were still expanded. I opened a box of Hornady they had just to make sure I wasn't nuts. I wasn't nuts. Brought the lack of crimp to the attention of one of the store employees, and he tried to tell me it was how it should be.
Shoot uncrimped ammo in a revolver, it can pull the bullet and lock it up. Shoot uncrimped ammo in a Marlin, it can set the bullet back - not a good thing with .357 rounds. As JAD said about fingers...
Another friend had a case of .45, and it acted underloaded (weak, dirty, etc.) Another friend has gotten recall notices for overloaded lots.
That's the thing about poor "quality control," as opposed to product with a low content specification. Most of the product is usually OK and some may be excellent, but the problems are frequent, usually random, and you don't know when they're going to show up. I won't use FM in my guns, and encourage other people not to use it in their guns.