I went to a auction last night and they had a large lot of 38+P, 357, & 9mm ammo. Most of the 9mm ammo said law enforcement use only on the box. What is the difference in this ammo and store bought ammo. Most of this was Winchester and Federal Hydra-shok. Some of the boxes had dates on them from the early 90's. Wanna kill these ads? We can help!